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diff --git a/macros/latex/contrib/exam-lite/LICENSE b/macros/latex/contrib/exam-lite/LICENSE
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diff --git a/macros/latex/contrib/exam-lite/README.md b/macros/latex/contrib/exam-lite/README.md
new file mode 100644
index 0000000000..a1e0503946
--- /dev/null
+++ b/macros/latex/contrib/exam-lite/README.md
@@ -0,0 +1,55 @@
+# A simple template for preparing exams in LaTex
+<!-- ALL-CONTRIBUTORS-BADGE:START - Do not remove or modify this section -->
+[![All Contributors](https://img.shields.io/badge/all_contributors-3-orange.svg?style=flat-square)](#contributors-)
+<!-- ALL-CONTRIBUTORS-BADGE:END -->
+
+<p align="center">
+ <img alt="logo" width="300" src="imgs/logo_exam.png">
+</p>
+
+## Description
+The template is devoted to the quicker preparation of exams in LaTex.
+
+### Main Features of this template:
+- Minimalistic design
+- Include the custom logo of the affiliation
+- Predefined commands for a subject, study year, study program, exam type, place of exam, date
+- Many macros contained in this package speed up the process of preparing the necessary ingredients for the exam
+- Automatic calculation of total points
+
+## Disclaimer
+This framework is provided as-is, and there are no guarantees that it fits your purposes or that it is bug-free. Use it at your own risk!
+
+## License
+Material in this folder is licensed under a
+[Creative Commons Attribution-ShareAlike 4.0 International License][cc-by-sa].
+
+[![CC BY-SA 4.0][cc-by-sa-image]][cc-by-sa]
+
+[cc-by-sa]: http://creativecommons.org/licenses/by-sa/4.0/
+[cc-by-sa-image]: https://licensebuttons.net/l/by-sa/4.0/88x31.png
+[cc-by-sa-shield]: https://img.shields.io/badge/License-CC%20BY--SA%204.0-lightgrey.svg
+
+## Contributors ✨
+
+Thanks goes to these wonderful people ([emoji key](https://allcontributors.org/docs/en/emoji-key)):
+
+<!-- ALL-CONTRIBUTORS-LIST:START - Do not remove or modify this section -->
+<!-- prettier-ignore-start -->
+<!-- markdownlint-disable -->
+<table>
+ <tbody>
+ <tr>
+ <td align="center" valign="top" width="14.28%"><a href="https://github.com/KukovecRok"><img src="https://avatars.githubusercontent.com/u/33880044?v=4?s=100" width="100px;" alt="Tatookie"/><br /><sub><b>Tatookie</b></sub></a><br /><a href="https://github.com/firefly-cpp/exam-lite-latex/commits?author=KukovecRok" title="Code">💻</a> <a href="https://github.com/firefly-cpp/exam-lite-latex/issues?q=author%3AKukovecRok" title="Bug reports">🐛</a> <a href="https://github.com/firefly-cpp/exam-lite-latex/commits?author=KukovecRok" title="Documentation">📖</a> <a href="#example-KukovecRok" title="Examples">💡</a> <a href="#platform-KukovecRok" title="Packaging/porting to new platform">📦</a></td>
+ <td align="center" valign="top" width="14.28%"><a href="http://www.iztok-jr-fister.eu/"><img src="https://avatars.githubusercontent.com/u/1633361?v=4?s=100" width="100px;" alt="Iztok Fister Jr."/><br /><sub><b>Iztok Fister Jr.</b></sub></a><br /><a href="https://github.com/firefly-cpp/exam-lite-latex/commits?author=firefly-cpp" title="Code">💻</a> <a href="https://github.com/firefly-cpp/exam-lite-latex/issues?q=author%3Afirefly-cpp" title="Bug reports">🐛</a> <a href="#mentoring-firefly-cpp" title="Mentoring">🧑‍🏫</a></td>
+ <td align="center" valign="top" width="14.28%"><a href="https://github.com/rhododendrom"><img src="https://avatars.githubusercontent.com/u/3198785?v=4?s=100" width="100px;" alt="rhododendrom"/><br /><sub><b>rhododendrom</b></sub></a><br /><a href="#design-rhododendrom" title="Design">🎨</a></td>
+ </tr>
+ </tbody>
+</table>
+
+<!-- markdownlint-restore -->
+<!-- prettier-ignore-end -->
+
+<!-- ALL-CONTRIBUTORS-LIST:END -->
+
+This project follows the [all-contributors](https://github.com/all-contributors/all-contributors) specification. Contributions of any kind welcome! \ No newline at end of file
diff --git a/macros/latex/contrib/exam-lite/exam-lite.cls b/macros/latex/contrib/exam-lite/exam-lite.cls
new file mode 100644
index 0000000000..3d9344caa1
--- /dev/null
+++ b/macros/latex/contrib/exam-lite/exam-lite.cls
@@ -0,0 +1,320 @@
+% Author: Rok Kukovec and Iztok Fister Jr.
+% CC-BY-SA-4.0 license
+
+\NeedsTeXFormat{LaTeX2e}
+\ProvidesClass{exam-lite}[2023/02/06 Very simple Latex template for exams]
+
+% include dependencies
+%-----------------------------------------------------------
+\RequirePackage{babel}
+\RequirePackage{graphicx}
+\RequirePackage{fancyhdr}
+\RequirePackage[skip=10pt plus1pt, indent=40pt]{parskip}
+\RequirePackage[T1]{fontenc}
+\RequirePackage[utf8]{inputenc}
+\RequirePackage{framed}
+\RequirePackage{lipsum}
+\RequirePackage{datetime}
+\RequirePackage{enumerate}
+\RequirePackage{totcount}
+
+
+% global class options
+%--------------------------------------------------------------------------------------------------------------
+\DeclareOption*{\PassOptionsToClass{\CurrentOption}{article}}
+
+% Path to logo image
+\def\ImagePath#1{\def\@ImagePath{#1}}
+\newcommand{\pImagePath}{\@ImagePath}
+
+% Language of the exam
+\def\examlanguage#1{\def\@examlanguage{#1}}
+\newcommand{\pexamlanguage}{\@examlanguage}
+
+% Name of the subject
+\def\subject#1{\def\@subject{#1}}
+\newcommand{\psubject}{\@subject}
+
+% Academic year
+\def\academicyear#1{\def\@academicyear{#1}}
+\newcommand{\pacademicyear}{\@academicyear}
+
+% Date of the exam
+\def\examdate#1{\def\@examdate{#1}}
+\newcommand{\pexamdate}{\@examdate}
+
+% Study program
+\def\studyprogram#1{\def\@studyprogram{#1}}
+\newcommand{\pstudyprogram}{\@studyprogram}
+
+% Location of the exam (usually classroom label)
+\def\location#1{\def\@location{#1}}
+\newcommand{\plocation}{\@location}
+
+% Exam period
+\def\examperiod#1{\def\@examperiod{#1}}
+\newcommand{\pexamperiod}{\@examperiod}
+
+% Exam period, usually number (one subject has one or more exams)
+\def\examid#1{\def\@examid{#1}}
+\newcommand{\pexamid}{\@examid}
+
+% Subacronym of the subject
+\def\subacronym#1{\def\@subacronym{#1}}
+\newcommand{\psubacronym}{\@subacronym}
+
+% Name and Surname of the student
+\def\namesurname#1{\def\@namesurname{#1}}
+\newcommand{\pnamesurname}{\@namesurname}
+
+% ID of the student
+\def\studentid#1{\def\@studentid{#1}}
+\newcommand{\pstudentid}{\@studentid}
+
+% Instructions
+\def\instructions#1{\def\@instructions{#1}}
+\newcommand{\pinstructions}{\@instructions}
+
+% Question (translation)
+\def\questiontext#1{\def\@questiontext{#1}}
+\newcommand{\pquestiontext}{\@questiontext}
+
+% Question (translation)
+\def\pointstext#1{\def\@pointstext{#1}}
+\newcommand{\ppointstext}{\@pointstext}
+
+% Points (translation)
+\def\points#1{\def\@points{#1}}
+\newcommand{\ppoints}{\@points}
+
+\def\instructionstext#1{\def\@instructionstext{#1}}
+\newcommand{\pinstructionstext}{\@instructionstext}
+
+\def\sumpts#1{\def\@sumpts{#1}}
+\newcommand{\psumpts}{\@sumpts}
+
+\def\writingtime#1{\def\@writingtime{#1}}
+\newcommand{\pwritingtime}{\@writingtime}
+
+\def\writingtimeminutes#1{\def\@writingtimeminutes{#1}}
+\newcommand{\pwritingtimeminutes}{\@writingtimeminutes}
+
+\def\grade#1{\def\@grade{#1}}
+\newcommand{\pgrade}{\@grade}
+
+% use declared options
+%-----------------------------------------------------------
+
+% language of the exam
+\DeclareOption{exam}{%
+ \def\examtype{1} % 1: izpit-exam, 2: kolokvij-midterm
+}
+% language of the midterm
+\DeclareOption{midterm}{%
+ \def\examtype{2} % 1: izpit-exam, 2: kolokvij-midterm
+}
+
+\def\typeexam#1{\def\@typeexam{#1}}
+\newcommand{\ptypeexam}{\@typeexam}
+
+\def\aboutexamheader#1{\def\@aboutexamheader{#1}}
+\newcommand{\paboutexamheader}{\@aboutexamheader}
+%-----------------------------------------------------------
+% Slovene version
+%-----------------------------------------------------------
+\DeclareOption{slovene}{%
+ \if\examtype1\typeexam{IZPIT}\fi
+ \if\examtype2\typeexam{VMESNI IZPIT}\fi
+ \if\examtype1\examperiod{Vmesni izpit: }\fi
+ \if\examtype2\examperiod{Izpitni rok: }\fi
+ \namesurname{Ime in Priimek:}
+ \studentid{ID Študenta:}
+ \instructions{NAVODILA}
+ \questiontext{Vpra\v{s}anje}
+ \pointstext{to\v{c}k}
+ \sumpts{Število točk: }
+ \writingtime{Čas pisanja: }
+ \grade{Ocena: }
+
+ % Define a command for the logo of institution and exam information
+ \newcommand{\aboutexam}[1]{
+ \noindent
+ \fancyfoot{}
+ \renewcommand{\headrulewidth}{0pt}
+ \renewcommand{\footrulewidth}{0pt}
+ \pagestyle{fancy}
+ \fancyhf{}
+ % Show logo of author's institution on the left side
+ \fancyhead[L]{\raisebox{\dimexpr-\height+\baselineskip}[0pt][0pt]{\includegraphics[width=5cm, height=4cm, keepaspectratio]{\pImagePath}}}
+ % Show exam information on right side
+ \fancyhead[R]{\leavevmode\large
+ \begin{tabular}[t]{l@{}}
+ #1
+ \end{tabular}}
+ \vspace*{3\baselineskip}
+ }
+
+ \aboutexamheader{\aboutexam{Predmet: \psubject \\
+ Študijsko leto: \pacademicyear \\
+ Študijski program: \pstudyprogram \\
+ \pexamperiod \pexamid \\
+ Prostor: \plocation \\
+ Datum: \displaydate{examdate}}}
+
+\newcommand{\@Conjugation}{Unknown}
+\newcommand{\Conjugation}[1]{\renewcommand{\@Conjugation}{#1}}
+\newcommand{\Apply@Conjugation}{%
+ \begingroup
+ \long\def\@one{1}\long\def\@two{2}\long\def\@three{3}\long\def\@four{4}%
+ \ifx\@Conjugation\@one
+ a)%
+ \else
+ \ifx\@Conjugation\@two
+ i)%
+ \else
+ \ifx\@Conjugation\@three
+ e)%
+ \else
+ \ifx\@Conjugation\@four
+ e)% Due to only 1 "all-"else option - this entry is duplicated
+ \else
+ )%
+ \fi
+ \fi
+ \fi
+ \fi
+ \endgroup
+ }
+}
+%-----------------------------------------------------------
+% English version
+%-----------------------------------------------------------
+\DeclareOption{english}{%
+ \if\examtype1\typeexam{EXAM}\fi
+ \if\examtype2\typeexam{MIDTERM}\fi
+ \if\examtype1\examperiod{Exam period: }\fi
+ \if\examtype2\examperiod{Midterm: }\fi
+ \namesurname{Name and Surname:}
+ \studentid{Student ID:}
+ \instructions{INSTRUCTIONS}
+ \questiontext{Question}
+ \pointstext{point}
+ \sumpts{Number of points: }
+ \writingtime{Writing time: }
+ \grade{Grade: }
+
+ % Define a command for the logo of institution and exam information
+ \newcommand{\aboutexam}[1]{
+ \noindent
+ \fancyfoot{}
+ \renewcommand{\headrulewidth}{0pt}
+ \renewcommand{\footrulewidth}{0pt}
+ \pagestyle{fancy}
+ \fancyhf{}
+ % show logo of author's institution on the left side
+ \fancyhead[L]{\raisebox{\dimexpr-\height+\baselineskip}[0pt][0pt]{\includegraphics[width=6cm, height=3.5cm, keepaspectratio]{\pImagePath}}}
+ % show exam information on right side
+ \fancyhead[R]{\leavevmode\large
+ \begin{tabular}[t]{l@{}}
+ #1
+ \end{tabular}}
+ \vspace*{3\baselineskip}
+ }
+
+ \aboutexamheader{\aboutexam{Subject: \psubject \\
+ Study year: \pacademicyear \\
+ Study program: \pstudyprogram \\
+ \pexamperiod \pexamid \\
+ Place: \plocation \\
+ Date: \displaydate{examdate}}}
+
+\newcommand{\@Conjugation}{Unknown}
+\newcommand{\Conjugation}[1]{\renewcommand{\@Conjugation}{#1}}
+\newcommand{\Apply@Conjugation}{%
+ \begingroup
+ \long\def\@one{1}%
+ \ifx\@Conjugation\@one
+ )%
+ \else
+ s)%
+ \fi
+ \endgroup
+ }
+
+}
+\newtotcounter{sum_pts}
+%-----------------------------------------------------------
+% Process options
+%-----------------------------------------------------------
+\ProcessOptions\relax
+% Load class
+\LoadClass[a4paper,onecolumn]{article}
+%--------------------------------------------------------------------------------------------------------------
+% Set page margins
+%-----------------------------------------------------------
+\addtolength{\oddsidemargin}{-.800in}
+\addtolength{\evensidemargin}{-.800in}
+\addtolength{\textwidth}{1.75in}
+\addtolength{\topmargin}{-.800in}
+\addtolength{\textheight}{1.75in}
+ \setlength{\headheight}{12.05pt}
+
+% Set a little indendation for paragraphs
+\setlength{\parindent}{0.1em}
+
+% Space between paragraphs
+\setlength{\parskip}{1em}
+%-----------------------------------------------------------
+% First page
+%-----------------------------------------------------------
+\newcommand{\makefirstpage}{
+ \large
+ \paboutexamheader
+
+ \noindent\makebox[\linewidth]{\rule{0.9\paperwidth}{0.4pt}}
+
+ \psumpts\:\:\:\:\:\:\:/\total{sum_pts} \hfill \pwritingtime \pwritingtimeminutes min
+ \vspace{-1.2cm}
+ \begin{center}\textbf{{\LARGE\ptypeexam}}\end{center}
+ \vspace{1cm}
+ \pnamesurname\hrulefill
+ \vspace{0.5cm}
+
+ \pstudentid\hrulefill
+ \vspace{0.5cm}
+
+ \pgrade\hrulefill
+ \vspace*{4\baselineskip}
+
+ \noindent\underline{\pinstructions}
+ \vspace{5mm}
+ \pinstructionstext
+}
+%-----------------------------------------------------------
+% Header of all pages but first
+%-----------------------------------------------------------
+\newcommand{\makenextheaders}{
+ \newpage % put question in a new page
+ \lhead{\displaydate{examdate}}
+ \rhead{\pacademicyear}
+ \chead{{\large\psubject}}
+ % space between head and first question (text)
+ \setlength{\headsep}{0.4in}
+ \cfoot{\thepage}
+ \setlength{\footskip}{30pt}
+}
+%-----------------------------------------------------------
+% Commands for questions
+%-----------------------------------------------------------
+
+% Question counter command - Question i
+\newcommand{\qncounter}[1]{\paragraph{\underline{\pquestiontext{ #1}}}\hfill\\\vspace{2mm}\\}
+
+% Basic Question command - #1 What is ...? #2 No. pts #3 vspace in cm (points next to question)
+\newcommand{\question}[3]{{\parbox{14cm}{#1}} {\Conjugation{#2} \addtocounter{sum_pts}{#2}\hfill\textsc{(#2~\ppointstext\Apply@Conjugation}}{\vspace{#3 cm}}}
+
+% Long Question command - #1 What is ...? #2 No. pts #3 vspace in cm (points under question)
+\newcommand{\longquestion}[3]{{\parbox{16.5cm}{#1}} {\Conjugation{#2} \addtocounter{sum_pts}{#2}\hfill\\\hspace*{\fill}\textsc{(#2~\ppointstext\Apply@Conjugation}}{\vspace{#3 cm}}}
+
+% Alinea command - \item #1 What is ...? #2 No. pts #3 vspace in cm
+\newcommand{\alinea}[3]{\item \!\!)\:{\parbox{12cm}{#1}} {\Conjugation{#2} \addtocounter{sum_pts}{#2}\hfill\textsc{(#2~\ppointstext\Apply@Conjugation}{\vspace{#3 cm}}}}
diff --git a/macros/latex/contrib/exam-lite/exam-lite.tex b/macros/latex/contrib/exam-lite/exam-lite.tex
new file mode 100644
index 0000000000..788e65773f
--- /dev/null
+++ b/macros/latex/contrib/exam-lite/exam-lite.tex
@@ -0,0 +1,98 @@
+% Author: Rok Kukovec and Iztok Fister Jr.
+% CC-BY-SA-4.0 license
+
+\documentclass[english, exam]{exam-lite} %1: slovene, english; 2: exam, midterm
+\begin{document}
+
+% change according to your data
+%-----------------------------------------------------------
+% path to logo image
+%\ImagePath{imgs/um-logo.png} % Slovenian FERI UM logo
+%\ImagePath{imgs/logo-um-feri-ang.png} % English FERI UM logo
+\ImagePath{imgs/exam-lite-affl-logo.png} % logo example
+% name of the subject
+\subject{Interesting computer science}
+% academic year
+\academicyear{2022-2023}
+% study program
+\studyprogram{Prog-I}
+% id of exam
+\examid{1}
+% location of exam
+\location{A-1}
+% date of exam
+\newdate{examdate}{07}{02}{2022}
+% acronym of subject
+\subacronym{PISZ}
+% writing time in minutes
+\writingtimeminutes{90}
+
+% predefined instructions in english
+\instructionstext{
+ \begin{enumerate}
+ \item The exam consists of 10 questions.\\
+ \item The use of a calculator is not allowed.\\
+ \item Write only what the question asks for.\\
+ \item You do not get minus points for wrong answers.\\
+ \end{enumerate}
+}
+% predefined instructions in slovene
+\iffalse % multi-line coment
+\instructionstext{
+ \begin{enumerate}
+ \item Izpit je sestavljen iz 10 vprašanj.\\
+ \item Uporaba kalkulatorja ni dovoljena. \\
+ \item Zapišite le tisto, kar zahteva vprašanje. \\
+ \item Napačni odgovori ne prinašajo minus točk. \\
+ \end{enumerate}
+}
+\fi % end of multi-line coment
+%-----------------------------------------------------------
+
+% create first page
+%-----------------------------------------------------------
+\makefirstpage
+%-----------------------------------------------------------
+\makenextheaders
+%-----------------------------------------------------------
+% SYNTAX questions of the exam
+%-----------------------------------------------------------
+% Question Number
+% \qncounter{Number}
+% Points next to question
+% \question{What do you want to ask?}{No. of points}{vspace in cm}
+% Points under question
+% \longquestion{What do you want to ask?}{No. of points}{vspace in cm}
+% Used in begin enumerate/itemize - question with multiple subquestions
+% \alinea{What do you want to ask?}{No. of points}{vspace in cm}
+%-----------------------------------------------------------
+\makeatletter
+% Set page coutner to 1 - First page with questions
+\setcounter{page}{1}
+
+\qncounter{1}
+\question{List some of the disadvantages of data standardisation.}{3}{0}
+
+\qncounter{2}
+\question{Write down the main features of intelligent systems.}{2}{1}
+
+\qncounter{3}
+\longquestion{Please list at least 5 data preparation techniques, write down their characteristics, and for what purposes these methods are used.}{5}{0}
+
+\begin{enumerate}[i]
+ \alinea{Why is it important to perform data preparation before starting to learn a classifier?}{3}{3}
+ \alinea{What is meant by the term \textbf{dataset}, and how is it constructed?}{2}{2}
+\end{enumerate}
+
+\qncounter{4}
+\question{Circle the letter before the correct answer}{1}{0}
+\begin{enumerate}
+ \item Right one
+ \item First wrong
+ \item Second wrong
+\end{enumerate}
+
+\qncounter{5}
+\longquestion{What is the purpose of data standardization and normalization in machine learning and how do they differ? Can you provide examples of how these techniques are applied in practice, their benefits and limitations, and how they impact model performance? Can you also explain how these techniques can be used in preprocessing data for deep learning models and the impact of not properly standardizing or normalizing data on the training and prediction phases?}{5}{1}
+
+\end{document}
diff --git a/macros/latex/contrib/exam-lite/exam_lite.pdf b/macros/latex/contrib/exam-lite/exam_lite.pdf
new file mode 100644
index 0000000000..9b152551eb
--- /dev/null
+++ b/macros/latex/contrib/exam-lite/exam_lite.pdf
Binary files differ
diff --git a/macros/latex/contrib/exam-lite/imgs/exam-lite-affl-logo.png b/macros/latex/contrib/exam-lite/imgs/exam-lite-affl-logo.png
new file mode 100644
index 0000000000..0670d134ca
--- /dev/null
+++ b/macros/latex/contrib/exam-lite/imgs/exam-lite-affl-logo.png
Binary files differ
diff --git a/macros/latex/contrib/physics2/README.md b/macros/latex/contrib/physics2/README.md
new file mode 100644
index 0000000000..f8efc73124
--- /dev/null
+++ b/macros/latex/contrib/physics2/README.md
@@ -0,0 +1,27 @@
+# The `physics2` package
+
+This package defines commands for typesetting math formulae faster and
+more simply. `physics2` is a modularized package, each module provides its
+own function while `physics2.sty` itself only provides very few functions.
+Therefore you can load modules separately after loading `physics2`.
+
+Modules of `physics2` provide the following supports:
+
+- Automatic braces;
+- Dirac bra-ket notation;
+- Easy way to typeset diagonal matrices and matrices with similar entries;
+- Double cross and double dot (binary) operators for tensors;
+
+**Welcome to pull requests
+[here](https://github.com/AlphaZTX/physics2/pulls).**
+
+## License
+
+This work may be distributed and/or modified under the conditions of the
+[LaTeX Project Public License](http://www.latex-project.org/lppl.txt),
+either version 1.3c of this license or (at your option) any later version.
+
+This work has the LPPL maintenance status `maintained`.
+
+The Current Maintainer of this work is
+[Zhang Tingxuan](https://www.ctan.org/author/zhang-tx). \ No newline at end of file
diff --git a/macros/latex/contrib/physics2/doc/phy2docdef.tex b/macros/latex/contrib/physics2/doc/phy2docdef.tex
new file mode 100644
index 0000000000..55ee148034
--- /dev/null
+++ b/macros/latex/contrib/physics2/doc/phy2docdef.tex
@@ -0,0 +1,70 @@
+%% This is part of physics2 documentation.
+%% ******************************************************
+%% * This work may be distributed and/or modified under *
+%% * the conditions of the LaTeX Project Public License *
+%% * http://www.latex-project.org/lppl.txt *
+%% * either version 1.3c of this license or any later *
+%% * version. *
+%% ******************************************************
+\makeatletter
+\usepackage[nohyperref]{doc}
+\renewcommand*\l@subsection{\@dottedtocline{2}{1.5em}{2.1em}}
+\def\contentsonly{\@starttoc{toc}}
+\usepackage{manfnt}
+\protected\def\pardanger{\ifnum\lastnodetype=1%
+ \leavevmode\hbox to \z@{\hss\dbend\hskip10pt\hskip\parindent}\else
+ \ifnum\lastnodetype=11%
+ \leavevmode\hbox to \z@{\hss\dbend\hskip10pt}%
+ \fi\fi\ignorespaces}
+\usepackage{hyperref,color,xr}
+\definecolor{pkgcolor}{RGB}{0,120,80}
+\definecolor{moducolor}{RGB}{0,0,150}
+\hypersetup{colorlinks,urlcolor=magenta,linkcolor=black,filecolor=blue,
+ pdfstartview=FitH,pdfview=FitH,pdfcreator=XeTeX output}
+\def\s@pkg#1{\texorpdfstring{\textcolor{pkgcolor}{\textsf{#1}}}{“#1”}}
+\def\@pkg#1{\texorpdfstring{\hyperref{https://www.ctan.org/pkg/#1}%
+ {}{}{\textcolor{pkgcolor}{\textsf{#1}}}}{“#1”}}
+\DeclareRobustCommand\pkg{\@ifstar\@pkg\s@pkg}
+\def\modu#1{\texorpdfstring{\textcolor{moducolor}{\textsf{#1}}}{“#1”}}
+\def\opt#1{\texorpdfstring{\texttt{#1}}{“#1”}}
+\protected\def\marg#1{\texttt\{\meta{#1}\texttt\}}
+\protected\def\oarg#1{\texttt[\meta{#1}\texttt]}
+\parindent2.4em
+\linespread{1.06}
+\usepackage{multicol,fancyvrb,verbatim,array,hologo}
+\fvset{xleftmargin=\parindent}
+\newenvironment{displayed}{\trivlist\item[]\leftskip\parindent\relax}{\endtrivlist}
+\usepackage[normalem]{ulem}
+\newcounter{example}[subsection]
+\renewcommand\theexample{\thesubsection.\arabic{example}}
+\newwrite\example@out
+\def\example@name{\jobname.example.aux}
+\long\def\example@start{\begingroup\@bsphack
+ \immediate\openout\example@out=\example@name
+ \let\do\@makeother\dospecials\catcode`\^^M\active
+ \def\verbatim@processline{\immediate\write\example@out{\the\verbatim@line}}%
+ \verbatim@start}
+\long\def\example@end{\immediate\closeout\example@out\@esphack\endgroup%
+ \trivlist\item[]\relax
+ \leavevmode\hbox to \z@{%
+ \hbox to \z@{\hss{\footnotesize[\theexample]}\hskip10pt}%
+ \hskip\parindent
+ \begin{minipage}[c]{0.55\textwidth}%
+ \small\verbatiminput{\example@name}%
+ \end{minipage}%
+ \fbox{%
+ \begin{minipage}[c]{0.5\textwidth}%
+ \normalsize\input{\example@name}%
+ \end{minipage}%
+ }%
+ \hss}%
+ \endtrivlist}
+\newenvironment{example*}[1]%
+ {\refstepcounter{example}\label{#1}\example@start}{\example@end}
+\newenvironment{example}
+ {\stepcounter{example}\example@start}{\example@end}
+\author{Zhang Tingxuan}
+\date{2023/01/25\quad Version 0.1\thanks{%
+ \url{https://www.github.com/AlphaZTX/physics2}}}
+\makeatother
+\endinput \ No newline at end of file
diff --git a/macros/latex/contrib/physics2/doc/physics2-legacy.pdf b/macros/latex/contrib/physics2/doc/physics2-legacy.pdf
new file mode 100644
index 0000000000..5a2d78c54d
--- /dev/null
+++ b/macros/latex/contrib/physics2/doc/physics2-legacy.pdf
Binary files differ
diff --git a/macros/latex/contrib/physics2/doc/physics2-legacy.tex b/macros/latex/contrib/physics2/doc/physics2-legacy.tex
new file mode 100644
index 0000000000..fea5894ad0
--- /dev/null
+++ b/macros/latex/contrib/physics2/doc/physics2-legacy.tex
@@ -0,0 +1,539 @@
+%% ******************************************************
+%% * This work may be distributed and/or modified under *
+%% * the conditions of the LaTeX Project Public License *
+%% * http://www.latex-project.org/lppl.txt *
+%% * either version 1.3c of this license or any later *
+%% * version. *
+%% ******************************************************
+\documentclass[11pt,letterpaper]{article}
+\usepackage{amsmath}
+\usepackage{unicode-math}
+\setmainfont{Latin Modern Roman}
+\setsansfont{Latin Modern Sans}
+\setmonofont{Latin Modern Mono}
+\setmathfont{Latin Modern Math}
+\usepackage{physics2}
+\usephysicsmodule{ab}
+\usephysicsmodule{ab.legacy,nabla.legacy}
+\usephysicsmodule{op.legacy,qtext.legacy}
+\usephysicsmodule{ab.braket}
+\usephysicsmodule{diagmat}
+\usephysicsmodule[showleft=3,showtop=3]{xmat}
+\usepackage{derivative}
+\input{phy2docdef.tex}
+\title{\pkg{physics2} manual for the legacy \pkg{physics} users}
+\begin{document}
+\maketitle
+
+\begin{abstract}
+This short document describes \pkg*{physics2} package for those who are
+used to the \pkg*{physics} package. This document is only a simple reference
+manual for:
+\begin{itemize}
+\item Frequent users of the legacy \pkg{physics} package;
+\item Those who have to maintain a document written with \pkg{physics};
+\item Users who failed to use \pkg*{unicode-math} with \pkg{physics}.
+\end{itemize}
+It seems no reason for any other user to read \emph{this} document instead of
+the \hyperref{./physics2.pdf}{}{}{package documentation} of \pkg{physics2},
+because this document cannot describe the package in detail.
+
+In this document, the modules of \pkg{physics2} will be introduced in
+the same order as the \pkg{physics} documentation.
+\end{abstract}
+
+\section*{Contents}
+\begin{multicols}{2}
+\contentsonly
+\end{multicols}
+\ifnum\value{page}=1 \vfil\clearpage\fi
+
+\section{Before you start}
+\subsection{Legacy problems with \pkg{physics} package}
+\label{subsec:physics-legacy-problems}
+The \pkg{physics} package provides \cs{qty} command for automatic-sizing
+braces. The \cs{qty} command would cause conflict with the \pkg{siunitx}
+package, which provides a unified method to typeset numbers and units
+correctly.
+
+Besides, after you loaded \pkg{physics}, when you type \cs{homework} you
+will get Maxwell equations and Schrödinger equation. The \cs{homework}
+command is ``declared'' in \texttt{physics.sty} but it was not described
+in the documentation. That is, if you have defined \cs{homework} before
+loading \pkg{physics} package, \pkg{physics} would overwrite the definition
+``silently''.
+
+The vector-notation part of \pkg{physics} uses \pkg*{amsmath}'s (more exactly,
+\texttt{amsbsy.sty}'s) \cs{boldsymbol} command to generate bold vectors.
+Commands for cross/dot product are defined with \cs{boldsymbol}.
+\cs{boldsymbol} uses \cs{mathversion}, a \LaTeXe\ kernel command that works
+well with traditional TFM-based fonts but fails when using \pkg{unicode-math}.
+
+In the definition of \cs{imat}, \cs{xmat}, \cs{dmat} and \cs{admat} commands
+from \pkg{physics}, there is a \cs{newtoks} command which allocates a token
+list register and two \cs{newcount} commands allocating two count registers.
+Every time you write a command like \cs{imat} in your document, then one token
+list register and two count registers will be wasted. What's even worse is
+that, if you wrote really too many matrix commands from \pkg{physics} (for
+example, 32767 \cs{imat}s in \hologo{LuaLaTeX}), there'd be no room for a new
+\cs{count}.
+
+\pkg{physics} integrated all the functions in one file (\texttt{physics.sty}),
+that is, you cannot load one of the total seven parts of functions; you have
+to load the seven parts altogether, even included the extra \cs{homework}
+command we mentioned in the first paragraph.
+
+Moreover, the code of \texttt{physics.sty} ``abuses'' the \texttt{g}-type
+arguments of \pkg*{xparse} package. Therefore the syntax of \pkg{physics} package
+looks kind of weird. See \hyperref{https://tex.stackexchange.com/questions/%
+470819/macros-dv-and-pdv-eat-the-subsequent-parenthesis-argument/470842#470842}%
+{}{}{here} for more.
+
+\subsection{Loading \pkg{physics2}}
+The \pkg{physics2} package includes different modules, among which every module
+focuses on one single function.
+
+Write the following line in the preamble to load \pkg{physics2}:
+\begin{Verbatim}
+\usepackage{physics2}
+\end{Verbatim}
+But this is not enough. \pkg{physics2} contains different modules, among which,
+only the \modu{common} module would be loaded automatically by the package.
+If you want to load other modules of \pkg{physics2}, write this after loading
+\pkg{physics2} package:
+\begin{displayed}
+\cs{usephysicsmodule}\marg{module list}
+\end{displayed}
+For example, ``\verb|\usephysicsmodule{ab,doubleprod}|'' loads the \modu{ab}
+module and the \modu{doubleprod} module.
+
+You can also load a module with options:
+\begin{displayed}
+\cs{usephysicsmodule}\oarg{option list}\marg{module}
+\end{displayed}
+For example, ``\verb|\usephysicsmodule[legacy]{ab}|'' loads \modu{ab} with the
+option ``\opt{legacy}''.
+
+\pardanger Attention, if you used any font package in your document, remember
+that \pkg{physics2} requires to be loaded \emph{after} font packages.
+
+
+\section{List of commands}
+\subsection{Automatic bracing}\label{subsec:ab-and-legacy}
+As mentioned in \S\ref{subsec:physics-legacy-problems}, the \cs{qty} command
+from \pkg{physics} would cause conflicts with \pkg{siunitx}. The command for
+automatic braces in \pkg{physics2} is \cs{ab}, a shorthand for
+{\bfseries a}utomatic {\bfseries b}races.
+
+The \cs{ab} command requires the \modu{ab} module, so don't forget to write
+\verb|\usephysicsmodule{ab}| in the preamble after you loaded \pkg{physics2}.
+Always remember, \emph{do not put an \cs{ab} separately in the end of a math
+formula}. Take some examples:
+\begin{example}
+\[ \ab ( \frac12 ) \quad
+ \ab [ \frac12 ] \quad
+ \ab\{ \frac12 \} \]
+\end{example}
+\cs{ab} can modify a delimiter-braced subformula. But the delimiters should
+not be out of the range described by the following chart:
+\begin{center}
+\begin{tabular}{c@{\hskip2em}l@{\hskip2em}c}
+\opt{(},\quad\opt{)} && \\
+\opt{[},\quad\opt{]} && \\
+\cs{\{},\quad\cs{\}} &or& \cs{lbrace},\quad\cs{rbrace} \\
+\opt{<},\quad\opt{>} &or& \cs{langle},\quad\cs{rangle} \\
+\opt{|},\quad\opt{|} &or& \cs{vert},\quad\cs{vert} \\
+ \cs{|},\quad\cs{|} &or& \cs{Vert},\quad\cs{Vert}
+\end{tabular}
+\end{center}
+For example, \verb|$\ab{foo}$| and \verb|$\ab(foo]$| are illegal, but
+\verb|$\ab\{foo\}$| and \verb|$\ab(foo)$| are okay; \verb|$\ab([)$|
+is okay but \verb|$\ab(()$| is illegal.
+
+\pardanger Attention, if you want to delimit a subformula with ``\{'' and
+``\}'', you can only write \verb|\{|, \verb|\}| or \cs{lbrace}, \cs{rbrace}
+around it. \verb|{| and \verb|}| are not supported in \modu{ab} module.
+
+Between \cs{ab} and the first delimiter can be a ``biggg'' command, that is,
+from \cs{big} to \cs{Bigg}. Actually, you can also write \cs{biggg} and
+\cs{Biggg} because \pkg{physics2} defines these after you load it. For example,
+\begin{example}
+\[ \ab\Big \| \frac12 \| \quad
+ \ab\Bigg < \frac12 > \quad
+ \ab\Biggg| \frac12 | \]
+\end{example}
+Between \cs{ab} and the first delimiter can also be a star (\opt{*}), which
+means ``use the default size of delimiters''. But in this situation, you
+needn't use the \cs{ab} command at all.
+
+The \pkg{physics} package provides commands like \cs{pqty}, \cs{bqty}. In
+the \modu{ab} module of \pkg{physics2}, these commands have changed to
+\cs{pab}, \cs{bab}, etc. The following example shows all the
+\texttt{\textbackslash}$X$\texttt{ab} commands in \modu{ab} module:
+\begin{example}
+\def\0{\frac12}
+\[ \pab{\0} \quad \bab{\0}
+ \quad \Bab{\0} \]
+\[ \aab{\0} \quad \vab{\0}
+ \quad \Vab{\0} \]
+\end{example}
+Also, after \texttt{\textbackslash}$X$\texttt{ab} can be a ``biggg'' command
+or a star. For example,
+\begin{example}
+\def\0{\frac12}
+\[ \pab\Big{\0} \quad \bab*{\0} \]
+\end{example}
+
+\pkg{physics} also provides the following commands:
+\begin{Verbatim}[fontsize=\small]
+\abs \norm \eval \order \comm \acomm \pb
+\end{Verbatim}
+\pardanger These commands are not originally supported by \pkg{physics2}, but
+the first four commands can be used through the \modu{ab.legacy} module of
+\pkg{physics2}:
+\begin{Verbatim}
+\usephysicsmodule{ab.legacy}
+\end{Verbatim}
+For example,
+\begin{example}
+\def\0{\frac12}
+\[ \abs{\0} \quad \abs\Big{\0}
+ \quad \abs*{\0} \]
+\end{example}
+Users of the legacy \pkg{physics} package should notice that the syntax of
+\cs{eval} has been changed to \cs{eval}\oarg{left delimiter}\marg{subformula}.
+The \modu{ab.legacy} module abandoned the \verb"\eval(foo|"-like syntax. The
+\meta{left delimiter} argument is optional. For example,
+\begin{example}
+\def\0{\frac12x}
+\[ \eval{\0}_a^b \quad
+ \eval[(]{\0}_a^b \quad
+ \eval[[]\big{\0}_a^b \]
+\end{example}
+The \cs{comm}, \cs{acomm} and \cs{pb} (Poisson bracket) are not supported.
+But you can write like \verb|\ab[foo,baz]| or \verb|\bab{foo,baz}| instead.
+
+By the way, you can set the ``order'' symbol in \modu{ab.legacy} through
+the \opt{order} option like this:
+\begin{Verbatim}
+\usephysicsmodule[order=O]{ab.legacy}
+\end{Verbatim}
+Then \verb|$\order(N)$| yields $O(N)$.
+
+\subsection{Vector notation}
+Unfortunately, there is not a plan for \pkg{physics2} to support this part
+of \pkg{physics} completely, but the rest of this section will show some
+methods to maintain the document written with \pkg{physics}.
+
+The \cs{vb}(\opt{*}), \cs{va}(\opt{*}) and \cs{vu}(\opt{*}) are not supported
+in any module of \pkg{physics2}. But these commands can be defined by copying
+the following lines below and pasting them in the preamble:
+\begin{Verbatim}[fontsize=\small]
+\makeatletter
+\newcommand\vb{\@ifstar\boldsymbol\mathbf}
+\newcommand\va[1]{\@ifstar{\vec{#1}}{\vec{\mathrm{#1}}}}
+\newcommand\vu[1]{%
+ \@ifstar{\hat{\boldsymbol{#1}}}{\hat{\mathbf{#1}}}}
+\makeatother
+\end{Verbatim}
+The \cs{boldsymbol} command requires the \pkg*{amsmath} or \pkg*{bm} package.
+If you prefer to use \pkg{bm}, you can also use the \cs{bm} command.
+What's more, if you tried the commands above, you might find that,
+the result of \cs{va} above is different from that of \pkg{physics}.
+This is beacuse, if you choose to present a vector in bold, it's alomost
+no need to put a \cs{vec} ($\vec{\mskip9mu}$) sign above it.
+
+However, the method above may not work well with \pkg*{unicode-math}
+because there are so many OpenType math fonts without a bold version.
+When using \pkg{unicode-math}, it's recommended to use \cs{symbf} and
+\cs{symbfit} for a separate vector. For example, \verb|$\symbf{0}$| yields
+$\symbf{0}$, and \verb|$\symbfit{A}$| yields $\symbfit{A}$.
+
+The \cs{vdot} and \cs{cross} commands are not supported in any module
+of \pkg{physics2}. Actually, there is no need to use a bold ``$\cdot$''
+or ``$\times$'' for the products of two vectors. Using \cs{cdot} and
+\cs{times} is enough.
+
+The commands related to ``$\nabla$'' are supported through \modu{nabla.legacy}
+module. These commands are \cs{grad}, \cs{div} and \cs{curl}. These commands
+should not be put in the end of a math formula either (just like \cs{ab}).
+Notice that the former \cs{div} command for a ``$\divsymbol$'' (if there
+exists one) is redefined as \cs{divsymbol}. For example,
+\begin{example}
+% \usephysicsmodule{nabla.legacy}
+\[ \grad F \quad
+ \grad(\frac G2) \]
+\[ \div\Bigg[X] \quad
+ \curl*\{\frac Y2\} \]
+\[ 2 \divsymbol 1 \]
+\end{example}
+Actually, the nabla-related commands end with \cs{ab}. Thus, the subformula
+after these commands can be delimited with \verb|()|, \verb|[]| and \verb|\{\}|.
+
+The \modu{nabla.legacy} requires the \pkg*{fixdif} package at least
+version 2.0 (file date: 2023/01/31 or after 2023/01/31).
+
+By the way, if you are used to write \cs{bm} for a vector but interested in
+\pkg{unicode-math}, the \modu{bm-um.legacy} module would be a passable
+alternative to \pkg{bm} package. Notice that the \cs{bm} command from the
+\modu{bm-um.legacy} module can only take \emph{one} letter (or \emph{one} digit)
+as its argument.
+
+\subsection{Operators}
+There's no plan for \pkg{physics2} to support this part of \pkg{physics}
+completely. The syntax in this part of \pkg{physics} (such as \verb|\tan[2](x)|)
+abuses \pkg*{xparse}.
+
+It's suggested to write like this if you used the \modu{ab} module:
+\begin{Verbatim}[fontsize=\small]
+$ \sin^2 \ab( \frac{\alpha}{2} ) $
+\end{Verbatim}
+Rather than take the superscript as an optional argument of the command of
+log-like functions.
+
+The \pkg{physics} package provides a bundle of commands for log-like functions
+that have not been defined in the \LaTeXe\ kernel. Those log-like functions
+can be used with the \modu{op.legacy} module; this module do not support
+the syntax of \pkg{physics} either. For example:
+\begin{example}
+% \usephysicsmodule{op.legacy}
+\[ \asin^2 x \quad \rank \{ A \} \]
+\end{example}
+The \cs{Re} and \cs{Im} commands are redefined as operators ``$\Re$'' and
+``$\Im$'', while $\Resymbol$ and $\Imsymbol$ are reserved as \cs{Resymbol} and
+\cs{Imsymbol}. $\Resymbol$ and $\Imsymbol$ are ordinary symbols but $\Re$ and
+$\Im$ are opetators.
+
+\subsection{Quick quad text}\label{subsec:qtext}
+The \modu{qtext.legacy} module provides the \cs{q}\meta{foo} commands
+for \cs{quad}-wrapped texts. These commands have the same syntax as
+\pkg{physics}. For example,
+\begin{example}
+% \usephysicsmodule{qtext.legacy}
+\[ A \qq {foo bar} B \]
+\[ A \qq*{foo bar} B \]
+\[ C \qcc D \qcc* E \]
+\[ F \qif G \qthen H \]
+\end{example}
+All the commands described in \S2.4 of
+\hyperref{http://mirrors.ctan.org/macros/latex/contrib/physics/physics.pdf}{}{}%
+{\textsf{physics} documentation} are supported when using \modu{qtext.legacy}
+module, but I don't recommend to use this module unless you are maintaining a
+document written with \pkg{physics}'s \cs{q}\meta{foo} commands.
+
+\subsection{Derivatives}
+There is no plan for \pkg{physics2} to support this part of \pkg{physics}. If
+you want to typeset the differential operators on a better sense, you can try
+the \pkg*{fixdif} package; if you want an easy way to type derivatives, you
+can try the \pkg*{derivative} package. These two packages can be used
+together. For example,
+\begin{example}
+% \usepackage{fixdif,derivative}
+\[ \pdv{f}{x,y,z} \d x \]
+Math ($\d x$) v.s.\ Text (\d x)
+\end{example}
+Here are the documentations of
+\hyperref{http://mirrors.ctan.org/macros/latex/contrib/fixdif/fixdif.pdf}%
+{}{}{\textsf{fixdif}} and
+\hyperref{http://mirrors.ctan.org/macros/latex/contrib/derivative/derivative%
+.pdf}{}{}{\textsf{derivative}}.
+
+\pkg{fixdif}'s commands behave better in superscripts and subscripts.
+
+\subsection{Dirac bra-ket notation}
+There are two solutions to Dirac bra-ket in \pkg{physics2} --- \modu{ab.braket}
+and \modu{braket}. These two modules are \emph{not} compatible and neither of
+them supports \pkg{physics}'s syntax completely.
+Click \hyperlink{para:ab.braket}{\textcolor{cyan}{here}} to see the
+\modu{ab.braket} module and \hyperlink{para:braket}{\textcolor{cyan}{here}}
+to see the \modu{braket} module.
+
+\paragraph{The \modu{ab.braket} module}
+\hypertarget{para:ab.braket}{This} module provides four commands --- \cs{bra}, \cs{ket}, \cs{braket} and
+\cs{ketbra}. After these commands can be a star (\opt{*}) or a ``biggg''
+command. These commands share similar syntaxes like \cs{ab}'s syntax. But,
+\emph{the bra-ket commands from \modu{ab.braket} module are completely different
+from \cs{ab}}. Their internal structures are different.
+
+The argument of \cs{bra} should be delimited with \opt{<} and \opt{|}, that is,
+\begin{center}
+\cs{bra} \opt{<} \meta{subformula} \opt{|}
+\end{center}
+For example,
+\begin{example}
+\[ \bra < \frac \phi 2 | \]
+\[ \bra*< \frac \phi 2 | \]
+\[ \bra\Big< \phi | \]
+\end{example}
+The argument of \cs{ket} should be delimited with \opt{|} and \opt{>}, that is,
+\begin{center}
+\cs{ket} \opt{|} \meta{subformula} \opt{>}
+\end{center}
+For example,
+\begin{example}
+\[ \ket | \frac \psi 2 > \]
+\[ \ket*| \frac \psi 2 > \]
+\[ \ket\Big| \psi > \]
+\end{example}
+\pardanger
+If you want to write ``$>$'' and ``$<$'' for relations in the argument of
+\cs{bra} and \cs{ket}, you can write \verb|\mathrel{>}| and \verb|\mathrel{<}|
+(although there is almost no such need).
+
+The argument of \cs{braket} should be delimited with \opt{<} and \opt{>},
+that is,
+\begin{center}
+\cs{braket} \opt{<} \meta{subformula} \opt{>}
+\end{center}
+In the \meta{subformula} argument, every ``\opt{|}'' will be regarded as an
+extensible vertical bar. For example,
+\begin{example}
+\[ \braket< \phi > \]
+\[ \braket< \phi | \psi > \]
+\[ \braket< \phi | A | \psi > \]
+\end{example}
+\begin{example}
+\def\0{\frac\phi2}
+\[ \braket < \0 | \psi > \]
+\[ \braket* < \0 | \psi > \]
+\[ \braket\Bigg< \0 | \psi > \]
+\end{example}
+The argument of \cs{ketbra} should be delimited with \opt{|} and \opt{|}.
+In the argument, \opt{>} and \opt{<} will be regarded as extensible $\rangle$
+and $\langle$. that is,
+\begin{center}
+\cs{ketbra} \opt{|} \meta{subformula$_1$} \opt{>} \meta{optional}
+ \opt{<} \meta{subformula$_2$} \opt{|}
+\end{center}
+For example,
+\begin{example}
+\def\0{\frac\phi2}
+\[ \ketbra | \0 >< \psi | \]
+\[ \ketbra* | \0 >< \psi | \]
+\[ \ketbra\Bigg| \0 >< \psi | \]
+\end{example}
+\begin{example}
+\def\0{\frac\phi2}
+\[ \ketbra| \0 >_x^y < \psi | \]
+\end{example}
+\pardanger
+If you want to write ``$>$'' and ``$<$'' for relations in the argument of
+\cs{braket} and \cs{ketbra}, you can write \cs{>} and \cs{<} (although there
+is almost no such need). It is quite different from \verb|\mathrel{>}| or
+\verb|\mathrel{<}| because in these commands' argument, \opt{>} and \opt{<}
+will be redefined.
+
+\paragraph{The \modu{braket} module}
+\begingroup
+\makeatletter\def\phy@requiremodule#1{}%
+\def\PackageWarning#1#2{}%
+\input phy-braket.sty\makeatother
+\hypertarget{para:braket}{This} module contains four commands --- \cs{bra},
+\cs{ket}, \cs{braket} and \cs{ketbra}. After these commands can be a star
+(\opt{*}) or a square-bracket-delimited size option, the size option can
+take the following values:
+\begin{center}
+\opt{big},\quad\opt{Big},\quad\opt{bigg},\quad\opt{Bigg},\quad
+\opt{biggg}\quad or\quad\opt{Biggg}.
+\end{center}
+Star stands for ``do not size the bra-ket automatically''.
+
+The argument(s) of these four commands are braced with \verb|{| and \verb|}|.
+\cs{bra} and \cs{ket} take one mandatory argument. For example,
+\begin{example}
+\def\0{\frac\phi2}
+\[ \bra {\0} \quad \bra* {\0}
+ \quad \bra[Big] {\0} \]
+\[ \ket {\0} \quad \ket* {\0}
+ \quad \ket[Big] {\0} \]
+\end{example}
+The \cs{braket} command, in default, can take two arguments.
+\begin{example}
+\def\0{\frac\phi2}
+\[ \braket {\0} {\psi} \quad
+ \braket*{\0} {\psi} \quad
+ \braket[big] {\0} {\psi} \]
+\end{example}
+If you want \cs{braket} to take one or three arguments, you can write the
+number of arguments in the sqare bracket. If you need to specify the size
+of bra-ket simultaneously, you need to separate the number and the size with
+a comma:
+\begin{example}
+\def\0{\frac\phi2}
+\[ \braket [1] {\0} \quad
+ \braket*[1] {\0} \]
+\[ \braket [3] {\0}{A}{\psi} \]
+\[ \braket[3,big] {\0}{A}{\psi}
+ \quad
+ \braket[Big,3] {\0}{A}{\psi} \]
+\end{example}
+The \cs{ketbra} command takes two mandatory arguments. It can also take an
+optional argument between the two mandatory arguments. The optional argument
+will be placed between $\rangle$ and $\langle$:
+\begin{example}
+\def\0{\frac\phi2}
+\[ \ketbra {\0} {\psi} \quad
+ \ketbra* {\0} {\psi} \]
+\[ \ketbra [Bigg] {\0} {\psi} \]
+\[ \ketbra {\0} [_x^y] {\psi} \]
+\end{example}
+\endgroup
+
+\subsection{Matrix macros}
+Unfortunately, \pkg{physics2} do not support the \cs{mqty} command from
+\pkg{physics}. If you are used to this command, you can write like this:
+\begin{Verbatim}[fontsize=\small]
+\newcommand\mqty[1]{\begin{matrix}#1\end{matrix}}
+\newcommand\pmqty[1]{\begin{pmatrix}#1\end{pmatrix}}
+$\ab(\mqty{foo})$ or $\pmqty{foo}$
+\end{Verbatim}
+These are equal to physics's \verb|\mqty(foo)| (require \pkg{amsmath}).
+
+\pkg{physics2}'s \modu{diagmat} module provides \cs{diagmat} command
+for diagonal matrices. For example,
+\begin{example}
+\[
+ \diagmat { 1, 2, 3 }
+\]
+\end{example}
+\begin{example}
+\[
+ \pdiagmat [ empty = {} ]
+ { a, b, c, d }
+\]
+\end{example}
+\cs{pdiagmat}, \cs{bdiagmat}, \cs{Bdiagmat}, \cs{vdiagmat} and \cs{Vdiagmat}
+are also available.
+
+\pkg{physics2}'s \modu{xmat} module provides \cs{xmat} command
+for matrices with formatted entries. For example,
+\begin{example}
+\[
+ \xmat{a}{2}{3}
+\]
+\end{example}
+\begin{example}
+% \usephysicsmodule
+% [showleft=3,showtop=3]{xmat}
+\[
+ \pxmat{X}{m}{n}
+\]
+\end{example}
+\begin{example}
+\[
+ \xmat [showleft=2,showtop=2,
+ format=\texttt{#1[#2][#3]}]
+ {x}{m}{n}
+\]
+\end{example}
+\cs{pxmat}, \cs{bxmat}, \cs{Bxmat}, \cs{vxmat} and \cs{Vxmat} are also available.
+
+
+
+
+
+
+
+
+
+\end{document} \ No newline at end of file
diff --git a/macros/latex/contrib/physics2/doc/physics2.pdf b/macros/latex/contrib/physics2/doc/physics2.pdf
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diff --git a/macros/latex/contrib/physics2/doc/physics2.tex b/macros/latex/contrib/physics2/doc/physics2.tex
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@@ -0,0 +1,567 @@
+%% ******************************************************
+%% * This work may be distributed and/or modified under *
+%% * the conditions of the LaTeX Project Public License *
+%% * http://www.latex-project.org/lppl.txt *
+%% * either version 1.3c of this license or any later *
+%% * version. *
+%% ******************************************************
+\documentclass[11pt,letterpaper]{article}
+\usepackage{amsmath}
+\usepackage{unicode-math}
+\setmainfont{Libertinus Serif}
+\setsansfont{Libertinus Sans}
+\setmonofont{Noto Sans Mono}[Scale=MatchLowercase]
+\setmathfont{Libertinus Math}
+\usepackage{physics2}
+\usephysicsmodule{ab,ab.braket}
+\usephysicsmodule{diagmat}
+\usephysicsmodule{doubleprod}
+\usephysicsmodule[showleft=3,showtop=3]{xmat}
+\usephysicsmodule{ab.legacy,nabla.legacy,op.legacy,qtext.legacy,bm-um.legacy}
+\input{phy2docdef.tex}
+\externaldocument[lega-]{physics2-legacy}
+\title{The \pkg{physics2} package}
+\begin{document}
+\maketitle
+
+\begin{abstract}
+This is the document for \pkg{physics2} package, which defines commands for
+typesetting math formulae faster and more simply. \pkg{physics2} is a
+modularized package, each module provides its own function.
+
+This document describes the \pkg{physics2} package in more detail.
+But if you are a user of the legacy \pkg{physics} package, you can click
+\hyperref{./physics2-legacy.pdf}{}{}{here} to see the documention for
+\pkg{physics} users before you start. If you never used \pkg{physics} package
+before, just read \emph{this} documentation.
+\end{abstract}
+
+\tableofcontents
+
+\section{Introduction}
+\subsection{The purpose of this package}
+This package aims to provide a bundle of commands for typesetting math faster
+in different modules. The commands provided by \pkg{physics2} and its different
+modules are designed to be short and easy to memorize.
+
+\subsection{Packages required}
+The \pkg{physics2} package itself only requires the \pkg*{keyval} package, which
+is part of the \pkg*{latex-graphics} bundle. Almost every \LaTeX\ distribution
+will include this bundle.
+
+Different modules of \pkg{physics2} might require different packages. It will
+be explained in the following sections that which module requires which package.
+
+The \pkg{physics2} package requires \LaTeXe\ kernel released after 2020/10.
+Please make sure that your \LaTeX\ distribution is not too old.
+
+\subsection{Loading the \pkg{physics2} package}
+Just like loading any package, write
+\begin{Verbatim}
+\usepackage{physics2}
+\end{Verbatim}
+in the preamble to load the \pkg{physics2} package. In this version,
+\pkg{physics2} doesn't provide a package option.
+
+However, \pkg{physics2} itself only provides very few functions. Actually, it
+just provides a method to load modules. You need to load different modules of
+\pkg{physics2} to have different kinds of functions applied to your document.
+
+\subsection{Loading a module of \pkg{physics2}}
+You can load a module of \pkg{physics2} only \emph{after} you write
+\verb|\usepackage{physics2}| in the preamble. Load a \pkg{physics2} module
+like this:
+\begin{center}
+\cs{usephysicsmodule}\marg{module}
+\end{center}
+The usage of \cs{usephysicsmodule} is similar to \cs{usepackage}, so you can
+load more than one modules in one line. For example,
+\begin{Verbatim}
+\usephysicsmodule{ab,ab.braket}
+\end{Verbatim}
+This line loads the \modu{ab} and \modu{ab.braket} modules.
+
+You can also load \emph{one} module with options. The options of a
+\pkg{physics2} module can be a comma-separated key-value list. For example,
+\begin{Verbatim}
+\usephysicsmodule[tightbraces=true]{ab}
+\usephysicsmodule{ab.braket,doubleprod}
+\end{Verbatim}
+These two lines load the \modu{ab} module with option
+\opt{tightbraces\:=\:true} and load \modu{ab.braket} and \modu{doubleprod}
+modules.
+
+\pardanger
+The \modu{common} module will be loaded automatically when you load the
+\pkg{physics2} package and \emph{only} the \modu{common} module will be
+loaded automatically. Any other module should be loaded manually by writing
+\cs{usephysicsmodule}\marg{module} after you loaded \pkg{physics2} in the
+preamble.
+
+The following sections introduce all the user-level modules of \pkg{physics2}.
+View back to the table of contents to see the names of user-level modules.
+
+\section{Modules of \pkg{physics2}}
+\subsection{The automatically loaded \modu{common} module}
+The \modu{common} module provides the following commands:
+
+\cs{delopen} and \cs{delclose}, followed by a math delimiter. They can be
+regarded as abbreviations of ``open delimiter'' and ``close delimiter''. If
+you had heard of the \pkg*{mleftright} package. You can regard \cs{delopen}
+and \cs{delclose} as a simpler version of \cs{mleft} and \cs{mright}.
+For example,
+\begin{example}
+\[ 0 \left(\frac12\right) 3 \]
+\[ 0 \delopen(\frac12\delclose) 3 \]
+\end{example}
+
+\cs{biggg} and \cs{Biggg}, followed by a math delimiter. They are even bigger
+than \cs{Bigg}. \cs{biggg} and \cs{Biggg} may be useful when you need to write
+something really tall in math mode, but most OpenType math font do not support
+\cs{langle} (or U+27E8) and \cs{rangle} (or U+27E9) in this large size. Take
+an example,
+\begin{example}
+\[\Biggg(\biggg(\Bigg(\bigg(\Big(\big((
+)\big)\Big)\bigg)\Bigg)\biggg)\Biggg)\]
+\end{example}
+\cs{bigggl}, \cs{bigggm}, \cs{bigggr}, \cs{Bigggl}, \cs{Bigggm} and \cs{Bigggr}
+are also supported.
+
+\subsection{The \modu{ab} module --- automatic braces}
+This module provides the command \cs{ab}. The \cs{ab} command, as a shorthand
+of ``automatic braces'', would specify the size of the following pair of
+delimiters. The delimiters after \cs{ab} should not be out of the range
+described by the following chart:
+\begin{center}
+\begin{tabular}{c@{\hskip2em}l@{\hskip2em}c}
+\opt{(},\quad\opt{)} && \\
+\opt{[},\quad\opt{]} && \\
+\cs{\{},\quad\cs{\}} &or& \cs{lbrace},\quad\cs{rbrace} \\
+\opt{<},\quad\opt{>} &or& \cs{langle},\quad\cs{rangle} \\
+\opt{|},\quad\opt{|} &or& \cs{vert},\quad\cs{vert} \\
+ \cs{|},\quad\cs{|} &or& \cs{Vert},\quad\cs{Vert}
+\end{tabular}
+\end{center}
+For example, it's illegal to write an ``\verb|\ab(|'' without a ``\verb|)|'';
+it's also illegal to write \verb|\ab=foo=|. Take some correct examples:
+\begin{example}
+\[ \ab ( \frac12 ) \quad
+ \ab [ \frac12 ] \quad
+ \ab\{ \frac12 \} \]
+\end{example}
+You can also write a command from \cs{big} to \cs{Biggg} between \cs{ab}
+and the first delimiter, which means to specify the size of delimiters manually.
+Also, you can write a star (\opt{*}) between \cs{ab} and the first delimiter,
+to prevent \cs{ab} from setting the size of delimiters. For example,
+\begin{example}
+\[ \ab <\frac12> \quad
+ \ab\biggg|\frac12| \quad
+ \ab* \|\frac12\| \]
+\end{example}
+\pardanger
+Always remember, do not put an \cs{ab} separately at the end of math mode like
+\verb|$\ab$|, because \cs{ab} will try to absorb the following math shift
+character (\verb|$|) as its argument.
+
+The \modu{ab} module also provides \texttt{\textbackslash}$X$\texttt{ab}
+commands, where $X$ can be \opt{p}, \opt{b}, \opt{B}, \opt{a}, \opt{v} and
+\opt{V}. These commands take a normal argument but not an argument delimited
+with paired delimiters. For example,
+\begin{example}
+\def\0{\frac12}
+\[ \pab{\0} \bab{\0} \Bab{\0} \]
+\[ \aab{\0} \vab{\0} \Vab{\0} \]
+\end{example}
+After \texttt{\textbackslash}$X$\texttt{ab} can be a ``biggg'' command or a
+star. For example,
+\begin{example}
+\def\0{\frac12}
+\[ \pab\Big{\0} \quad \bab*{\0} \]
+\end{example}
+
+\paragraph{The options of \modu{ab} module}
+\opt{tightbraces}, a bool type key, whose default value is \opt{true},
+influences whether thin skips are reserved around the paired delimiters.
+It only works with the automatically sized delimiters.
+
+\subsection{The \modu{ab.braket} module --- Dirac bra-ket notation}
+This module provides four commands --- \cs{bra}, \cs{ket}, \cs{braket} and
+\cs{ketbra}. After these commands can be a star (\opt{*}) or a ``biggg''
+command. These commands share similar syntaxes like \cs{ab}'s syntax. But,
+\emph{the bra-ket commands from \modu{ab.braket} module are completely different
+from \cs{ab}}. Their internal structures are different.
+
+The argument of \cs{bra} should be delimited with \opt{<} and \opt{|}, that is,
+\begin{center}
+\cs{bra} \opt{<} \meta{subformula} \opt{|}
+\end{center}
+For example,
+\begin{example}
+\[ \bra < \frac \phi 2 | \]
+\[ \bra*< \frac \phi 2 | \]
+\[ \bra\Big< \phi | \]
+\end{example}
+The argument of \cs{ket} should be delimited with \opt{|} and \opt{>}, that is,
+\begin{center}
+\cs{ket} \opt{|} \meta{subformula} \opt{>}
+\end{center}
+For example,
+\begin{example}
+\[ \ket | \frac \psi 2 > \]
+\[ \ket*| \frac \psi 2 > \]
+\[ \ket\Big| \psi > \]
+\end{example}
+\pardanger
+If you want to write ``$>$'' and ``$<$'' for relations in the argument of
+\cs{bra} and \cs{ket}, you can write \verb|\mathrel{>}| and \verb|\mathrel{<}|
+(although there is almost no such need).
+
+The argument of \cs{braket} should be delimited with \opt{<} and \opt{>},
+that is,
+\begin{center}
+\cs{braket} \opt{<} \meta{subformula} \opt{>}
+\end{center}
+In the \meta{subformula} argument, every ``\opt{|}'' will be regarded as an
+extensible vertical bar. For example,
+\begin{example}
+\[ \braket< \phi > \]
+\[ \braket< \phi | \psi > \]
+\[ \braket< \phi | A | \psi > \]
+\end{example}
+\begin{example}
+\def\0{\frac\phi2}
+\[ \braket < \0 | \psi > \]
+\[ \braket* < \0 | \psi > \]
+\[ \braket\Bigg< \0 | \psi > \]
+\end{example}
+The argument of \cs{ketbra} should be delimited with \opt{|} and \opt{|}.
+In the argument, \opt{>} and \opt{<} will be regarded as extensible $\rangle$
+and $\langle$. that is,
+\begin{center}
+\cs{ketbra} \opt{|} \meta{subformula$_1$} \opt{>} \meta{optional}
+ \opt{<} \meta{subformula$_2$} \opt{|}
+\end{center}
+For example,
+\begin{example}
+\def\0{\frac\phi2}
+\[ \ketbra | \0 >< \psi | \]
+\[ \ketbra* | \0 >< \psi | \]
+\[ \ketbra\Bigg| \0 >< \psi | \]
+\end{example}
+\begin{example}
+\def\0{\frac\phi2}
+\[ \ketbra| \0 >_x^y < \psi | \]
+\end{example}
+\pardanger
+If you want to write ``$>$'' and ``$<$'' for relations in the argument of
+\cs{braket} and \cs{ketbra}, you can write \cs{>} and \cs{<} (although there
+is almost no such need). It is quite different from \verb|\mathrel{>}| or
+\verb|\mathrel{<}| because in these commands' argument, \opt{>} and \opt{<}
+will be redefined.
+
+Next, the \modu{braket} module will be introduced. Please notice that
+\modu{braket} is conflict with \modu{ab.braket}, they cannot be used together.
+
+\subsection{The \modu{braket} module --- Dirac bra-ket notation}
+\begingroup
+\makeatletter\def\phy@requiremodule#1{}%
+\def\PackageWarning#1#2{}%
+\input phy-braket.sty\makeatother
+Please notice that this module is conflict with the \modu{ab.braket} module.
+Don't use them together.
+
+This module contains four commands --- \cs{bra}, \cs{ket}, \cs{braket} and
+\cs{ketbra}. After these commands can be a star (\opt{*}) or a
+square-bracket-delimited size option, the size option can
+take the following values:
+\begin{center}
+\opt{big},\quad\opt{Big},\quad\opt{bigg},\quad\opt{Bigg},\quad
+\opt{biggg}\quad or\quad\opt{Biggg}.
+\end{center}
+Star stands for ``do not size the bra-ket automatically''.
+
+The argument(s) of these four commands are braced with \verb|{| and \verb|}|.
+\cs{bra} and \cs{ket} take one mandatory argument. For example,
+\begin{example}
+\def\0{\frac\phi2}
+\[ \bra {\0} \quad \bra* {\0}
+ \quad \bra[Big] {\0} \]
+\[ \ket {\0} \quad \ket* {\0}
+ \quad \ket[Big] {\0} \]
+\end{example}
+The \cs{braket} command, in default, can take two arguments.
+\begin{example}
+\def\0{\frac\phi2}
+\[ \braket {\0} {\psi} \quad
+ \braket*{\0} {\psi} \quad
+ \braket[big] {\0} {\psi} \]
+\end{example}
+If you want \cs{braket} to take one or three arguments, you can write the
+number of arguments in the sqare bracket. If you need to specify the size
+of bra-ket simultaneously, you need to separate the number and the size with
+a comma:
+\begin{example}
+\def\0{\frac\phi2}
+\[ \braket [1] {\0} \quad
+ \braket*[1] {\0} \]
+\[ \braket [3] {\0}{A}{\psi} \]
+\[ \braket[3,big] {\0}{A}{\psi}
+ \quad
+ \braket[Big,3] {\0}{A}{\psi} \]
+\end{example}
+The \cs{ketbra} command takes two mandatory arguments. It can also take an
+optional argument between the two mandatory arguments. The optional argument
+will be placed between $\rangle$ and $\langle$:
+\begin{example}
+\def\0{\frac\phi2}
+\[ \ketbra {\0} {\psi} \quad
+ \ketbra* {\0} {\psi} \]
+\[ \ketbra [Bigg] {\0} {\psi} \]
+\[ \ketbra {\0} [_x^y] {\psi} \]
+\end{example}
+\endgroup
+
+\subsection{The \modu{diagmat} module --- simple diagonal matrices}
+This module provides \cs{diagmat} command:
+\begin{center}
+\cs{diagmat}\opt{[empty\:=\:}\meta{empty entry}\opt{]}\marg{diag}
+\end{center}
+where \meta{diag} is the diagonal of the diagonal matrix. The entries should
+be separated by commas. The \opt{empty} option is optional, with default value
+\opt{0}. For example,
+\begin{example}
+\[
+ \diagmat { 1, 2, 3 }
+\]
+\end{example}
+\cs{pdiagmat}, \cs{bdiagmat}, \cs{Bdiagmat}, \cs{vdiagmat} and \cs{Vdiagmat}
+are also available. Prefixes like \opt{p}, \opt{b}, \opt{B} have the same
+meaning as the \opt{p}, \opt{b}, \opt{B} in \pkg{amsmath}'s \opt{pmatrix},
+\opt{bmatrix} and \opt{Bmatrix}. For example,
+\begin{example}
+\[
+ \pdiagmat [ empty = {} ]
+ { a, b, c, d }
+\]
+\end{example}
+This module requires \pkg{amsmath}.
+
+\paragraph{The options of \modu{diagmat} module}
+You can set the default value of \cs{diagmat}'s empty entries in the module
+option like this:
+\begin{Verbatim}
+\usephysicsmodule[empty={\cdot}]{diagmat}
+\end{Verbatim}
+
+\subsection{The \modu{doubleprod} module --- tensors' double product operator}
+Take an example of this module:
+\begin{example}
+$ A \doublecross B \doubledot C $
+\end{example}
+\cs{doublecross} and \cs{doubledot} are regarded as binary operators by \TeX.
+
+\paragraph{The options of \modu{doubleprod} module}
+You can control the scale of ``$\times$'' and ``$\cdot$'' in \cs{doublecross}
+and \cs{doubledot} in module option. For example,
+\begin{Verbatim}
+\usephysicsmodule[crossscale=0.75,dotscale=1.2]{doubleprod}
+\end{Verbatim}
+The default values of \opt{crossscale} and \opt{dotscale} are \opt{0.8} and
+\opt{1}. You can also control the distances between the two ``$\times$''s and
+``$\cdot$''s through the \opt{crossopenup} and \opt{dotopenup} options.
+For example,
+\begin{Verbatim}
+\usephysicsmodule[crossopenup=.05,dotopenup=.25]{doubleprod}
+\end{Verbatim}
+The default values of \opt{crossopenup} and \opt{dotopenup} are \opt{0.02}
+and \opt{0.2}. The value stands for the multiple of current font size.
+Moreover, you can change the symbols produced by \cs{doublecross} and
+\cs{doubledot} by setting \opt{crosssymbol} and \opt{dotsymbol} in module
+option.
+
+\subsection{The \modu{xmat} module --- matrices with formatted entries}
+The \modu{xmat} module provides \cs{xmat} command for matrices with formatted
+entries:
+\begin{center}
+\cs{xmat}\oarg{options}\marg{entry}\marg{rows shown}\marg{cols shown}
+\end{center}
+If \meta{rows shown} and \meta{cols shown} are digits, the value of them
+must be less at least 2 than the value of \pkg{amsmath}'s \opt{MaxMatrixCols}
+counter. For example,
+\begin{example}
+\[
+ \xmat{a}{2}{3}
+\]
+\end{example}
+\cs{pxmat}, \cs{bxmat}, \cs{Bxmat}, \cs{vxmat} and \cs{Vxmat} are also
+available. The meaning of \opt{p} and so on is the same as the \opt{p}
+in \opt{pmatrix} of \pkg{amsmath}. For example,
+\begin{example}
+\[
+ \pxmat{M}{3}{3}
+\]
+\end{example}
+If \meta{rows shown} and \meta{cols shown} contain non-digit characters,
+extra dots will be added. For example,
+\begin{example}
+\[
+ \bxmat[showleft=3,showtop=2]
+ {X}{m}{n}
+\]
+\end{example}
+In this example we used the \opt{showleft} and \opt{showtop} options. The
+default value of them is the value of \opt{MaxMatrixCols} minus 2. You can
+also set them in the module option like this:
+\begin{Verbatim}
+\usephysicsmodule[showtop=3,showleft=3]{xmat}
+\end{Verbatim}
+Then every \cs{xmat} with non-digital \meta{rows shown} and \meta{cols shown}
+will have 2 top-most rows and 3 left-most columns shown. This will also
+influence ``\cs{xmat}''s with digital \meta{rows shown} and \meta{cols shown}
+when \meta{rows shown} and \meta{cols shown} are larger than the values
+corresponding to \opt{showtop} and \opt{showleft}. For example,
+\begin{example}
+% \usephysicsmodule
+% [showtop=3,showleft=3]{xmat}
+\[ \pxmat{A}{8}{8} \]
+\end{example}
+However, when \meta{rows shown} and \meta{cols shown} are 1 greater than
+\meta{showtop} and \meta{showleft}, for example, \meta{rows shown}$\:=4$ and
+\meta{cols shown}$\:=4$ in last example's settings, \cs{xmat} will still add
+the extra dots:
+\begin{example}
+% \usephysicsmodule
+% [showtop=3,showleft=3]{xmat}
+\[ \pxmat{A}{4}{4} \]
+\end{example}
+In such situations, we need to specify \opt{showtop} and \opt{showleft}
+manually. For example,
+\begin{example}
+% \usephysicsmodule
+% [showtop=3,showleft=3]{xmat}
+\[ \pxmat[showtop=4,showleft=4]
+ {A}{4}{4} \]
+\end{example}
+
+The \cs{xmat} command provides the \opt{format} option, which allows users
+to use a new entry format. For example,
+\begin{example}
+\[
+ \xmat [showleft=2,showtop=2,
+ format=\texttt{#1[#2][#3]}]
+ {x}{m}{n}
+\]
+\end{example}
+In the value of \opt{format} key, \verb|#1| stands for the common entry,
+or the first mandotary \meta{entry} argument of \cs{xmat}; \verb|#2|
+stands for the row index and \verb|#3| stands for the column index.
+
+This module requires \pkg{amsmath}.
+
+\paragraph{The options of \modu{xmat} module}
+Only \opt{showtop} and \opt{showleft} can be used as module options.
+\opt{format} should be only used in the optional argument of the
+\cs{xmat} command.
+
+\section{The ``legacy'' modules}
+The legacy modules have similar names like \meta{module}\opt{.legacy}. Most of
+them are designed to provide solutions to maintain documents written with the
+legacy \pkg{physics} package. It's not suggest to use them in a new document.
+
+\subsection{The \modu{ab.legacy} module}
+This module provides the following commands:
+\begin{Verbatim}[fontsize=\small]
+\abs \norm \eval \order
+\end{Verbatim}
+They can take a normal argument. Between these commands and their argument
+can be a ``biggg'' command or a star. For example,
+\begin{example}
+\def\0{\frac12}
+\[ \abs{\0} \quad
+ \norm\Big{\0} \quad
+ \order*{\0} \]
+\end{example}
+\begin{example}
+\def\0{\frac12x}
+\[ \eval{\0}_a^b \quad
+ \eval[(]{\0}_a^b \quad
+ \eval[[]\big{\0}_a^b \]
+\end{example}
+You can set the ``order'' symbol in this module through
+the \opt{order} option like this:
+\begin{Verbatim}
+\usephysicsmodule[order=O]{ab.legacy}
+\end{Verbatim}
+For further information of this module, see \S\ref*{lega-subsec:ab-and-legacy}
+of \hyperref{./physics2-legacy.pdf}{}{}{physics2-legacy}.
+
+\subsection{The \modu{bm-um.legacy} module}
+If you are maintaining a document with plenty of ``\cs{bm}''s or
+``\cs{boldsymbol}''s in it but want to use \pkg{unicode-math} package
+simultaneously, you could take a look at this module.
+
+The \cs{bm} command from \pkg{bm} package uses \cs{mathversion} to support
+its function, but there are few OpenType math fonts who released with a bold
+version. The \modu{bm-um.legacy} module provides a \cs{bm} command too, but
+this \cs{bm} can only take \emph{one} math character or a series of math
+characters sharing the same category code as its argument.
+If the argument was Latin letters or Greek letters, \cs{bm} would switch to
+the bold italic glyphs corresponding to them (if there exists bold italic
+glyphs); else \cs{bm} would switch to the bold upright glyphs. For example,
+\begin{example}
+$\bm{0}\bm{A}\bm{z}
+ \bm{\alpha}\bm{\Omega}$
+\end{example}
+
+\subsection{The \modu{nabla.legacy} module}
+This module provides some commands related to nabla ($\nabla$). Notice that
+this module requires the \pkg{fixdif} package with file date 2023/01/31 at
+minimum.
+
+This module defines \cs{grad} and \cs{curl} and redefines \cs{div}. For example,
+\begin{example}
+\[ \grad V \]
+\[ \div (x,y,z) \]
+\[ \curl(x,y,z) \]
+\end{example}
+The ``$\divsymbol$'' symbol was redefined as \cs{divsymbol}.
+
+\subsection{The \modu{op.legacy} module}
+This module provides a series of commands for log-like operators. They are
+\begin{Verbatim}
+\asin \acos \atan
+\acsc \asec \acot
+\Tr \tr \rank
+\erf \Res \res
+\PV \pv
+\Re \Im
+\end{Verbatim}
+where \cs{Re} and \cs{Im} are redefined. The first four lines of commands
+yield what they look like in math mode. For example,
+\begin{example}
+$\asin x$ \quad $\rank A$
+\end{example}
+\cs{PV} yields ``$\PV$'' as an ordinary symbol and \cs{pv} yields ``$\pv$''.
+For example,
+\begin{example}
+$\PV f(z)$ \quad $\pv f(z)$
+\end{example}
+\cs{Re} and \cs{Im} are redefined as ``$\Re$'' and ``$\Im$''. $\Resymbol$
+and $\Imsymbol$ are redefined as \cs{Resymbol} and \cs{Imsymbol}, in default.
+
+This module \emph{does not} require \pkg{amsmath}.
+
+\paragraph{The options of \modu{op.legacy} module}
+\opt{ReIm}, a bool key with default value \opt{true}, determines whether to
+redefine \cs{Re} and \cs{Im}. If you want to reserve the definition of
+\cs{Re} and \cs{Im}, you can write like this:
+\begin{Verbatim}
+\usephysicsmodule[ReIm=false]{op.legacy}
+\end{Verbatim}
+
+\subsection{The \modu{qtext.legacy} module}
+This module was written just to offer a method to maintain documents written
+with the legacy \pkg{physics} package. See \S\ref*{lega-subsec:qtext} of
+\hyperref{./physics2-legacy.pdf}{}{}{physics2-legacy} for more information.
+
+\end{document} \ No newline at end of file
diff --git a/macros/latex/contrib/physics2/tex/phy-ab.braket.sty b/macros/latex/contrib/physics2/tex/phy-ab.braket.sty
new file mode 100644
index 0000000000..4e3ab66141
--- /dev/null
+++ b/macros/latex/contrib/physics2/tex/phy-ab.braket.sty
@@ -0,0 +1,84 @@
+%%
+%% This is file `phy-ab.braket.sty',
+%% the `ab.braket' module of `physics2' package.
+%%
+%% ******************************************************
+%% * This work may be distributed and/or modified under *
+%% * the conditions of the LaTeX Project Public License *
+%% * *
+%% * http://www.latex-project.org/lppl.txt *
+%% * *
+%% * either version 1.3c of this license or any later *
+%% * version. *
+%% ******************************************************
+%%
+%% This work has the LPPL maintenance status `maintained'.
+%%
+%% The Current Maintainer of this work is Zhang Tingxuan.
+%%
+\ProvidesFile{phy-ab.braket.sty}
+ [2023/1/25 `ab.braket' module of `physics2.sty']
+% This module requires \phy@abopen and \phy@abclose from `ab'.
+\phy@requiremodule{ab}
+\ifdefined\phy@bra@@
+ \PackageWarning{physics2}{You cannot load `ab.braket' and `braket'
+ modules together.\MessageBreak Only `ab.braket' module works now.}
+\fi
+% \bra<foo|
+\phy@AB@gen{br.m}<{mr<|}{\mathopen#1\langle#2\mathclose#1\vert}
+\phy@AB@gen{br.a}<{r<|}{\phy@abopen\langle#1\phy@abclose\vert}
+\phy@d@l@genxm{br.m}
+\phy@d@l@genxa{br.a}
+\DeclareRobustCommand\bra{\phy@d@lx{br.m}{br.a}}
+% \ket|foo>
+\phy@AB@gen{kt.m}|{mr|>}{\mathopen#1\vert#2\mathclose#1\rangle}
+\phy@AB@gen{kt.a}|{r|>}{\phy@abopen\vert#1\phy@abclose\rangle}
+\phy@d@l@genxm{kt.m}
+\phy@d@l@genxa{kt.a}
+\DeclareRobustCommand\ket{\phy@d@lx{kt.m}{kt.a}}
+% \braket<foo|bar>
+\begingroup
+\catcode`\|=\active
+\gdef\phy@@mb@bk#1#2{\begingroup%
+ \mathcode`\|="8000\def|{\egroup#1\vert\bgroup}%
+ \def\<{\mathrel{<}}\def\>{\mathrel{>}}%
+ \mathopen#1\langle\bgroup#2\egroup\mathclose#1\rangle\endgroup}
+\gdef\phy@@ab@bk#1{\begingroup%
+ \mathcode`\|="8000\def|{\egroup\phy@abb@bkv\bgroup}%
+ \def\<{\mathrel{<}}\def\>{\mathrel{>}}%
+ \phy@abopen\langle\bgroup#1\egroup\phy@abclose\rangle\endgroup}
+\endgroup
+\def\phy@abb@bkv{\middle\vert}
+\phy@AB@gen{bk.m}<{mr<>}{\phy@@mb@bk#1{#2}}
+\phy@AB@gen{bk.a}<{r<>}{\phy@@ab@bk{#1}}
+\phy@d@l@genxm{bk.m}
+\phy@d@l@genxa{bk.a}
+\DeclareRobustCommand\braket{\phy@d@lx{bk.m}{bk.a}}
+% \ketbra|foo>bar<baz|
+\begingroup
+\catcode`\<=\active
+\catcode`\>=\active
+\gdef\phy@@mb@kb#1#2{\begingroup%
+ \mathcode`\<="8000 \mathcode`\>="8000%
+ \def<{#1\langle}\def>{#1\rangle}%
+ \def\<{\phy@abb@l}\def\>{\phy@abb@r}%
+ \mathopen#1\vert#2\mathclose#1\vert\endgroup}
+\endgroup
+\gdef\phy@@ab@kb#1>#2<#3\phy@@end{\begingroup%
+ \def\<{\phy@abb@l}\def\>{\phy@abb@r}%
+ \phy@abopen\vert\mathopen{\phy@mathvphantom{#3}}#1\phy@abclose\rangle#2%
+ \phy@abopen\langle#3\mathclose{\phy@mathvphantom{#1}}\phy@abclose\vert%
+\endgroup}
+\AtBeginDocument{\ifcsname symbf\endcsname%
+ \def\phy@abb@l{\Umathchar 3 \symoperators "003C }%
+ \def\phy@abb@r{\Umathchar 3 \symoperators "003E }%
+\fi}
+\def\phy@abb@l{\mathchar"313C }
+\def\phy@abb@r{\mathchar"313E }
+\phy@AB@gen{kb.m}|{mr||}{\phy@@mb@kb#1{#2}}
+\phy@AB@gen{kb.a}|{r||}{\phy@@ab@kb#1\phy@@end}
+\phy@d@l@genxm{kb.m}
+\phy@d@l@genxa{kb.a}
+\DeclareRobustCommand\ketbra{\phy@d@lx{kb.m}{kb.a}}
+\endinput
+%% End of file `phy-ab.braket.sty'.
diff --git a/macros/latex/contrib/physics2/tex/phy-ab.legacy.sty b/macros/latex/contrib/physics2/tex/phy-ab.legacy.sty
new file mode 100644
index 0000000000..018f221997
--- /dev/null
+++ b/macros/latex/contrib/physics2/tex/phy-ab.legacy.sty
@@ -0,0 +1,33 @@
+%%
+%% This is file `phy-ab.legacy.sty',
+%% the `ab.legacy' module of `physics2' package.
+%%
+%% ******************************************************
+%% * This work may be distributed and/or modified under *
+%% * the conditions of the LaTeX Project Public License *
+%% * *
+%% * http://www.latex-project.org/lppl.txt *
+%% * *
+%% * either version 1.3c of this license or any later *
+%% * version. *
+%% ******************************************************
+%%
+%% This work has the LPPL maintenance status `maintained'.
+%%
+%% The Current Maintainer of this work is Zhang Tingxuan.
+%%
+\ProvidesFile{phy-ab.legacy.sty}
+ [2023/1/25 `ab.legacy' module of `physics2.sty']
+\phy@requiremodule{ab}
+% The `tight' bool option, true or false.
+\phy@define@key{ab.legacy}{order}[\mathcal{O}]{\def\phy@ab@ordersym{#1}}
+% The default values to keys in this module.
+\phy@setkeys{ab.legacy}{order}
+\phy@processkeyopt{ab.legacy}
+% The braced operators.
+\DeclareRobustCommand\abs{\phy@d@ly\vert\vert}
+\DeclareRobustCommand\norm{\phy@d@ly\Vert\Vert}
+\DeclareRobustCommand\order{\phy@ab@ordersym\phy@d@ly()}
+\DeclareRobustCommand\eval[1][.]{\phy@d@ly#1|}
+\endinput
+%% End of file `phy-ab.legacy.sty'.
diff --git a/macros/latex/contrib/physics2/tex/phy-ab.sty b/macros/latex/contrib/physics2/tex/phy-ab.sty
new file mode 100644
index 0000000000..9bf477804f
--- /dev/null
+++ b/macros/latex/contrib/physics2/tex/phy-ab.sty
@@ -0,0 +1,104 @@
+%%
+%% This is file `phy-ab.sty',
+%% the `ab' module of `physics2' package.
+%%
+%% ******************************************************
+%% * This work may be distributed and/or modified under *
+%% * the conditions of the LaTeX Project Public License *
+%% * *
+%% * http://www.latex-project.org/lppl.txt *
+%% * *
+%% * either version 1.3c of this license or any later *
+%% * version. *
+%% ******************************************************
+%%
+%% This work has the LPPL maintenance status `maintained'.
+%%
+%% The Current Maintainer of this work is Zhang Tingxuan.
+%%
+\ProvidesFile{phy-ab.sty}
+ [2023/1/25 `ab' (autobraces) module of `physics2.sty']
+% \phy@requiremodule{common}
+% The `tightbraces' bool option, true or false.
+\phy@define@key{ab}{tightbraces}[true]{\def\@phy@abtight{#1}}
+% Execute the default values to keys in this module.
+\phy@setkeys{ab}{tightbraces=true}
+\phy@processkeyopt{ab}
+% \phy@abopen and \phy@abclose,
+% internal definition for all commands in this module.
+\ifx\@phy@abtight\phy@true
+ \let\phy@abopen\delopen
+ \let\phy@abclose\delclose
+\else
+ \let\phy@abopen\left
+ \let\phy@abclose\right
+\fi
+% The internal version of \ab. #1: `ab' or `mb'; #2: open symbol; (#3: arg-spec; #4: definition)
+\def\phy@AB@gen#1#2{\expandafter\DeclareDocumentCommand\csname phy@#1@\string#2\endcsname}
+% #1 (r<token1><token2>): inner content.
+\phy@AB@gen{ab}({r()}{\phy@abopen(#1\phy@abclose)}
+\phy@AB@gen{ab}[{r[]}{\phy@abopen[#1\phy@abclose]}
+\phy@AB@gen{ab}\{{r\{\}}{\phy@abopen\{#1\phy@abclose\}}
+\phy@AB@gen{ab}|{r||}{\phy@abopen|#1\phy@abclose|}
+\phy@AB@gen{ab}\|{r\|\|}{\phy@abopen\|#1\phy@abclose\|}
+\phy@AB@gen{ab}<{r<>}{\phy@abopen<#1\phy@abclose>}
+\phy@AB@gen{ab}\lbrace{r\lbrace\rbrace}{\phy@abopen\lbrace#1\phy@abclose\rbrace}
+\phy@AB@gen{ab}\vert{r\vert\vert}{\phy@abopen\vert#1\phy@abclose\vert}
+\phy@AB@gen{ab}\Vert{r\Vert\Vert}{\phy@abopen\Vert#1\phy@abclose\Vert}
+\phy@AB@gen{ab}\langle{r\langle\rangle}{\phy@abopen\langle#1\phy@abclose\rangle}
+% #1 (m): \biggg; #2 (r<token1><token2>): inner content.
+\phy@AB@gen{mb}({mr()}{\mathopen#1(#2\mathclose#1)}
+\phy@AB@gen{mb}[{mr[]}{\mathopen#1[#2\mathclose#1]}
+\phy@AB@gen{mb}\{{mr\{\}}{\mathopen#1\lbrace#2\mathclose#1\rbrace}
+\phy@AB@gen{mb}|{mr||}{\mathopen#1\vert#2\mathclose#1\vert}
+\phy@AB@gen{mb}\|{mr\|\|}{\mathopen#1\Vert#2\mathclose#1\Vert}
+\phy@AB@gen{mb}<{mr<>}{\mathopen#1\langle#2\mathclose#1\rangle}
+\phy@AB@gen{mb}\lbrace{mr\lbrace\rbrace}{\mathopen#1\lbrace#2\mathclose#1\rbrace}
+\phy@AB@gen{mb}\vert{mr\vert\vert}{\mathopen#1\vert#2\mathclose#1\vert}
+\phy@AB@gen{mb}\Vert{mr\Vert\Vert}{\mathopen#1\Vert#2\mathclose#1\Vert}
+\phy@AB@gen{mb}\langle{mr\langle\rangle}{\mathopen#1\langle#2\mathclose#1\rangle}
+% \phy@del, the automatic
+\def\phy@del#1#2#3{\phy@abopen#1#3\phy@abclose#2}
+\expandafter\def\csname phy@del\string*\endcsname#1#2#3{\mathopen#1#3\mathclose#2}
+\expandafter\def\csname phy@del\string\big\endcsname#1#2#3{\bigl#1#3\bigr#2}
+\expandafter\def\csname phy@del\string\Big\endcsname#1#2#3{\Bigl#1#3\Bigr#2}
+\expandafter\def\csname phy@del\string\bigg\endcsname#1#2#3{\biggl#1#3\biggr#2}
+\expandafter\def\csname phy@del\string\Bigg\endcsname#1#2#3{\Biggl#1#3\Biggr#2}
+\expandafter\def\csname phy@del\string\biggg\endcsname#1#2#3{\bigggl#1#3\bigggr#2}
+\expandafter\def\csname phy@del\string\Biggg\endcsname#1#2#3{\Bigggl#1#3\Bigggr#2}
+% \phy@AB@gb(a|b|..): gobble (a|b|..) arguments in the middle.
+\def\phy@AB@gba#1#2#3{#1#3}
+% In next two lines, #5 or #6 may contain more than one token, so they're grouped.
+\def\phy@AB@gbc#1#2#3#4#5{#1{#5}}
+\def\phy@AB@gbd#1#2#3#4#5#6{#1{#6}}
+% \phy@d@lx (phy_del_x): the internal defination of \ab.
+% #1: `mb', according to \phy@AB@gen; #2: `ab'; #3: star or big or left delimiter.
+\def\phy@d@lx#1#2#3{\ifcsname phy@del\string#3\endcsname
+ \phy@AB@gbd{\csname phy@d@lx#1\endcsname#3}% #3 is star or biggg, then get the next argument.
+ \else\phy@AB@gba{\csname phy@d@lx#2\endcsname#3}\fi}% #3 is delimiter, the braces are automatic.
+% The first two arguments of \phy@d@lx need to be generated by the following two commands.
+\def\phy@d@l@genxm#1{% generate arguments like `mb'
+ \expandafter\def\csname phy@d@lx#1\endcsname##1##2{%
+ \ifx##1*\let\phy@tempa=\relax\else\let\phy@tempa=##1\fi
+ \csname phy@#1@\string##2\endcsname\phy@tempa##2}}
+\def\phy@d@l@genxa#1{% generate arguments like `ab'
+ \expandafter\def\csname phy@d@lx#1\endcsname##1{%
+ \csname phy@#1@\string##1\endcsname##1}}
+% Generate the `mb' and `ab' arguments.
+\phy@d@l@genxm{mb}
+\phy@d@l@genxa{ab}
+% \phy@d@ly (phy_del_y): the internal defination of \(p|b|..)ab.
+\def\phy@d@ly#1#2#3{\ifcsname phy@del\string#3\endcsname
+ \phy@AB@gbc{\csname phy@del\string#3\endcsname#1#2}%
+ \else{\phy@del#1#2{#3}}\fi}
+% \ab(<subformula>), after \ab can be a star or \biggg.
+\DeclareRobustCommand\ab{\phy@d@lx{mb}{ab}}
+% \(p|b|..)ab{<subformula>}, after \(p|..)ab can be a star or \biggg.
+\DeclareRobustCommand\pab{\phy@d@ly()}
+\DeclareRobustCommand\bab{\phy@d@ly[]}
+\DeclareRobustCommand\Bab{\phy@d@ly\lbrace\rbrace}
+\DeclareRobustCommand\vab{\phy@d@ly\vert\vert}
+\DeclareRobustCommand\aab{\phy@d@ly\langle\rangle}
+\DeclareRobustCommand\Vab{\phy@d@ly\Vert\Vert}
+\endinput
+%% End of file `phy-ab.sty'.
diff --git a/macros/latex/contrib/physics2/tex/phy-bm-um.legacy.sty b/macros/latex/contrib/physics2/tex/phy-bm-um.legacy.sty
new file mode 100644
index 0000000000..c97b925deb
--- /dev/null
+++ b/macros/latex/contrib/physics2/tex/phy-bm-um.legacy.sty
@@ -0,0 +1,62 @@
+%%
+%% This is file `phy-bm-um.legacy.sty',
+%% the `bm-um.legacy' module of `physics2' package.
+%%
+%% ******************************************************
+%% * This work may be distributed and/or modified under *
+%% * the conditions of the LaTeX Project Public License *
+%% * *
+%% * http://www.latex-project.org/lppl.txt *
+%% * *
+%% * either version 1.3c of this license or any later *
+%% * version. *
+%% ******************************************************
+%%
+%% This work has the LPPL maintenance status `maintained'.
+%%
+%% The Current Maintainer of this work is Zhang Tingxuan.
+%%
+\ProvidesExplFile{phy-bm-um.legacy.sty}{2023/1/25}{}
+ {`bm-um.legacy' module of `physics2.sty'}
+\AtBeginDocument
+ {
+ \cs_if_exist:cF { symbf }
+ {
+ \PackageError { physics2 }
+ {
+ The ~ `bm-um.legacy' ~ module ~ requires ~
+ `unicode-math' ~ package
+ }
+ {
+ Have ~ you ~ used ~ `unicode-math' ~
+ in ~ the ~ preamble?
+ }
+ }
+ }
+\DeclareDocumentCommand \bm { m }
+ {
+ \mode_if_math:TF
+ {
+ \tl_if_head_eq_catcode:nNTF { #1 } A
+ {
+ \symbfit { #1 }
+ }
+ {
+ \symbf { #1 }
+ }
+ }
+ {
+ \PackageError { physics2 }
+ {
+ The ~ \string\bm\space command ~ should ~ be ~
+ used ~ in ~ math ~ mode ~ only. \MessageBreak
+ This ~ is ~ an ~ error ~ from ~ `bm-um.legacy' ~ module
+ }
+ {
+ Check ~ if ~ any ~ `\string\bm' ~ is ~ out ~
+ of ~ math ~ mode.
+ }
+ }
+ }
+\endinput
+%% End of file `phy-bm-um.legacy.sty'.
diff --git a/macros/latex/contrib/physics2/tex/phy-braket.sty b/macros/latex/contrib/physics2/tex/phy-braket.sty
new file mode 100644
index 0000000000..29c2656726
--- /dev/null
+++ b/macros/latex/contrib/physics2/tex/phy-braket.sty
@@ -0,0 +1,110 @@
+%%
+%% This is file `phy-braket.sty',
+%% the `braket' module of `physics2' package.
+%%
+%% ******************************************************
+%% * This work may be distributed and/or modified under *
+%% * the conditions of the LaTeX Project Public License *
+%% * *
+%% * http://www.latex-project.org/lppl.txt *
+%% * *
+%% * either version 1.3c of this license or any later *
+%% * version. *
+%% ******************************************************
+%%
+%% This work has the LPPL maintenance status `maintained'.
+%%
+%% The Current Maintainer of this work is Zhang Tingxuan.
+%%
+\ProvidesFile{phy-braket.sty}
+ [2023/1/25 `braket' module of `physics2.sty']
+% Here we need to get the definition of \phy@abopen and \phy@abclose.
+\phy@requiremodule{ab}
+\ifdefined\phy@abb@bkv
+ \PackageWarning{physics2}{You cannot load `ab.braket' and `braket'
+ modules together.\MessageBreak Only `braket' module works now.}
+\fi
+% \bra
+\DeclareDocumentCommand\bra{ s o m }{%
+ \IfBooleanTF{#1}%
+ {\mathopen\langle#3\mathclose\vert}%
+ {\IfValueTF{#2}%
+ {\csname#2l\endcsname\langle#3\csname#2r\endcsname\vert}%
+ {\phy@abopen\langle#3\phy@abclose\vert}%
+ }%
+}
+% \ket
+\DeclareDocumentCommand\ket{ s o m }{%
+ \IfBooleanTF{#1}%
+ {\mathopen\vert#3\mathclose\rangle}%
+ {\IfValueTF{#2}%
+ {\csname#2l\endcsname\vert#3\csname#2r\endcsname\rangle}%
+ {\phy@abopen\vert#3\phy@abclose\rangle}%
+ }%
+}
+% \braket
+\DeclareDocumentCommand\braket{ s O{} }{%
+ \IfBooleanTF{#1}%
+ {%
+ \gdef\@phy@bk@argnum{ii}%
+ \phy@bk@doopt{#2}%
+ \gdef\@phy@bk@l{mathopen}%
+ \gdef\@phy@bk@m{mathord}%
+ \gdef\@phy@bk@r{mathclose}%
+ }%
+ {%
+ \gdef\@phy@bk@argnum{ii}%
+ \gdef\@phy@bk@l{phy@abopen}%
+ \gdef\@phy@bk@m{middle}%
+ \gdef\@phy@bk@r{phy@abclose}%
+ \phy@bk@doopt{#2}%
+ }%
+ \csname phy@bk@in@\@phy@bk@argnum\endcsname%
+}
+% The internal version of \braket
+\def\phy@bk@in@i#1{%
+ \csname\@phy@bk@l\endcsname\langle{#1}%
+ \csname\@phy@bk@r\endcsname\rangle}
+\def\phy@bk@in@ii#1#2{%
+ \csname\@phy@bk@l\endcsname\langle{#1}%
+ \csname\@phy@bk@m\endcsname\vert{#2}%
+ \csname\@phy@bk@r\endcsname\rangle}
+\def\phy@bk@in@iii#1#2#3{%
+ \csname\@phy@bk@l\endcsname\langle{#1}%
+ \csname\@phy@bk@m\endcsname\vert{#2}%
+ \csname\@phy@bk@m\endcsname\vert{#3}%
+ \csname\@phy@bk@r\endcsname\rangle}
+% Parse the optional argument of \braket.
+\def\@phy@bk@do@pt#1,{\ifx#1\relax\@empty\else%
+ \edef\reserved@a{\zap@space#1 \@empty}%
+ \ifx\reserved@a\@empty\else%
+ \ifcsname phy@del\expandafter\string\csname\reserved@a\endcsname\endcsname%
+ \xdef\@phy@bk@l{\reserved@a l}%
+ \xdef\@phy@bk@m{\reserved@a}% but not m (m stands for \mathrel)
+ \xdef\@phy@bk@r{\reserved@a r}%
+ \else%
+ \ifnum\reserved@a>3%
+ \PackageError{physics2}{\string\braket\space can only take 3
+ mandatory arguments at most}{Check if you had written a number
+ more than 3 in the [optional] argument.}%
+ \fi%
+ \xdef\@phy@bk@argnum{\romannumeral\reserved@a}%
+ \fi%
+ \fi%
+\expandafter\@phy@bk@do@pt\fi}
+\def\phy@bk@doopt#1{\@phy@bk@do@pt#1,\relax,}
+% \ketbra
+\DeclareDocumentCommand\ketbra{ s o m O{} m }{%
+ \IfBooleanTF{#1}%
+ {\mathopen\vert#3\mathclose\rangle#4\mathopen\langle#5\mathclose\vert}%
+ {\IfValueTF{#2}%
+ {\csname#2l\endcsname\vert#3\csname#2r\endcsname\rangle#4%
+ \csname#2l\endcsname\langle#5\csname#2r\endcsname\vert}%
+ {\begingroup%
+ \phy@abopen\vert\mathopen{\phy@mathvphantom{#5}}#3\phy@abclose\rangle#4%
+ \phy@abopen\langle#5\mathclose{\phy@mathvphantom{#3}}\phy@abclose\vert%
+ \endgroup}%
+ }%
+}
+\endinput
+%% End of file `phy-braket.sty'.
diff --git a/macros/latex/contrib/physics2/tex/phy-common.sty b/macros/latex/contrib/physics2/tex/phy-common.sty
new file mode 100644
index 0000000000..1b0776a807
--- /dev/null
+++ b/macros/latex/contrib/physics2/tex/phy-common.sty
@@ -0,0 +1,67 @@
+%%
+%% This is file `phy-common.sty',
+%% the `common' module of `physics2' package.
+%%
+%% ******************************************************
+%% * This work may be distributed and/or modified under *
+%% * the conditions of the LaTeX Project Public License *
+%% * *
+%% * http://www.latex-project.org/lppl.txt *
+%% * *
+%% * either version 1.3c of this license or any later *
+%% * version. *
+%% ******************************************************
+%%
+%% This work has the LPPL maintenance status `maintained'.
+%%
+%% The Current Maintainer of this work is Zhang Tingxuan.
+%%
+\ProvidesFile{phy-common.sty}
+ [2023/1/25 `common' module of `physics2.sty']
+% Check if `unicode-math' loaded and (re)define the vert symbols.
+% The `\relax'es here are for \ifx to compare.
+\AtBeginDocument{\ifcsname symrm\endcsname
+ \protected\def\|{\Udelimiter 0 \symoperators "2016 }%
+ \protected\def\vert{\Udelimiter 0 \symoperators "007C\relax}%
+ \protected\def\Vert{\Udelimiter 0 \symoperators "2016\relax}%
+ \protected\def\mid{\Udelimiter 3 \symoperators "007C }%
+\fi}
+\protected\def\Vert{\delimiter"026B30D\relax}
+\protected\def\mid{\delimiter"326A30C }
+% \delopen and \delclose, make inner subformulae delimited by
+% \left and \right behave as an open plus a close atom.
+\DeclareRobustCommand\delopen{\mathopen{}\mathclose\bgroup\left}
+\DeclareRobustCommand\delclose{\aftergroup\egroup\right}
+% Extension to the 2e kernel biggggg commands.
+\DeclareRobustCommand\biggg[1]{\leavevmode@ifvmode
+ {\hbox{$\left#1\vbox to20.5\p@{}\right.\n@space$}}}
+\DeclareRobustCommand\Biggg[1]{\leavevmode@ifvmode
+ {\hbox{$\left#1\vbox to23.5\p@{}\right.\n@space$}}}
+\DeclareRobustCommand\bigggl{\mathopen\biggg}
+\DeclareRobustCommand\bigggm{\mathrel\biggg}
+\DeclareRobustCommand\bigggr{\mathclose\biggg}
+\DeclareRobustCommand\Bigggl{\mathopen\Biggg}
+\DeclareRobustCommand\Bigggm{\mathrel\Biggg}
+\DeclareRobustCommand\Bigggr{\mathclose\Biggg}
+% \phy@mathvphantom, does the same job as \vphantom in math mode actually.
+\def\phy@mathvphantom#1{\setbox\phy@tempboxa=\hbox{}%
+ \mathchoice%
+ {\setbox\@tempboxa\hbox{$\displaystyle#1$}%
+ \ht\phy@tempboxa=\ht\@tempboxa%
+ \dp\phy@tempboxa=\dp\@tempboxa%
+ \box\phy@tempboxa}%
+ {\setbox\@tempboxa\hbox{$\textstyle#1$}%
+ \ht\phy@tempboxa=\ht\@tempboxa%
+ \dp\phy@tempboxa=\dp\@tempboxa%
+ \box\phy@tempboxa}%
+ {\setbox\@tempboxa\hbox{$\scriptstyle#1$}%
+ \ht\phy@tempboxa=\ht\@tempboxa%
+ \dp\phy@tempboxa=\dp\@tempboxa%
+ \box\phy@tempboxa}%
+ {\setbox\@tempboxa\hbox{$\scriptscriptstyle#1$}%
+ \ht\phy@tempboxa=\ht\@tempboxa%
+ \dp\phy@tempboxa=\dp\@tempboxa%
+ \box\phy@tempboxa}%
+}
+\endinput
+%% End of file `phy-common.sty'.
diff --git a/macros/latex/contrib/physics2/tex/phy-diagmat.sty b/macros/latex/contrib/physics2/tex/phy-diagmat.sty
new file mode 100644
index 0000000000..c917f797b7
--- /dev/null
+++ b/macros/latex/contrib/physics2/tex/phy-diagmat.sty
@@ -0,0 +1,92 @@
+%%
+%% This is file `phy-diagmat.sty',
+%% the `diagmat' module of `physics2' package.
+%%
+%% ******************************************************
+%% * This work may be distributed and/or modified under *
+%% * the conditions of the LaTeX Project Public License *
+%% * *
+%% * http://www.latex-project.org/lppl.txt *
+%% * *
+%% * either version 1.3c of this license or any later *
+%% * version. *
+%% ******************************************************
+%%
+%% This work has the LPPL maintenance status `maintained'.
+%%
+%% The Current Maintainer of this work is Zhang Tingxuan.
+%%
+\ProvidesExplFile{phy-diagmat.sty}{2023/1/25}{}
+ {`diagmat' module of `physics2.sty'}
+\phy@requiremodule { explsetup }
+\RequirePackage { amsmath }
+\phy@define@key { diagmat } { empty } [ 0 ] { \tl_gset:Nn \l__phy_mat_empty_tl { #1 } }
+% New variables
+\clist_new:N \l__phy_mat_diag_clist
+\clist_new:N \l__phy_mat_tmpa_clist
+\clist_new:N \l__phy_mat_tmpb_clist
+\clist_new:N \l__phy_mat_diagpos_clist
+\int_new:N \l__phy_mat_dim_int
+\tl_new:N \l__phy_mat_line_tl
+\tl_new:N \l__phy_diagmat_tl
+\tl_new:N \l__phy_mat_empty_tl
+\tl_gset:Nn \l__phy_mat_empty_tl { 0 }
+\phy@processkeyopt { diagmat }
+\keys_define:nn { phy/diagmat }
+ {
+ empty .tl_set:N = \l__phy_mat_empty_tl ,
+ }
+% Document Commands
+\DeclareDocumentCommand \diagmat { O{} m }
+ { \__phy_diagmat_type:nnn { } { #1 } { #2 } }
+\DeclareDocumentCommand \pdiagmat { O{} m }
+ { \__phy_diagmat_type:nnn { p } { #1 } { #2 } }
+\DeclareDocumentCommand \bdiagmat { O{} m }
+ { \__phy_diagmat_type:nnn { b } { #1 } { #2 } }
+\DeclareDocumentCommand \Bdiagmat { O{} m }
+ { \__phy_diagmat_type:nnn { B } { #1 } { #2 } }
+\DeclareDocumentCommand \vdiagmat { O{} m }
+ { \__phy_diagmat_type:nnn { v } { #1 } { #2 } }
+\DeclareDocumentCommand \Vdiagmat { O{} m }
+ { \__phy_diagmat_type:nnn { V } { #1 } { #2 } }
+% Internal function
+\cs_new:Npn \__phy_diagmat_type:nnn #1#2#3
+ {
+ \group_begin:
+ \clist_set:Nn \l__phy_mat_diag_clist { #3 }
+ \int_set:Nn \l__phy_mat_dim_int { \clist_count:N \l__phy_mat_diag_clist }
+ \int_compare:nNnT { \l__phy_mat_dim_int } > { \value { MaxMatrixCols } }
+ { \setcounter { MaxMatrixCols } { \l__phy_mat_dim_int } }
+ \keys_set:nn { phy/diagmat } { #2 }
+ \tl_gclear:N \l__phy_diagmat_tl
+ \int_step_inline:nnn { 0 } { \l__phy_mat_dim_int - 1 }
+ {
+ \int_step_inline:nnn { 0 } { \l__phy_mat_dim_int - 1 }
+ {
+ \int_compare:nNnTF { ##1 } = { ####1 }
+ {
+ \clist_gpop:NN \l__phy_mat_diag_clist \l__phy_tmpa_tl
+ \tl_if_empty:NTF \l__phy_tmpa_tl
+ { \tl_gput_right:Nn \l__phy_mat_line_tl { \l__phy_mat_empty_tl } }
+ { \tl_gput_right:Nx \l__phy_mat_line_tl { \l__phy_tmpa_tl } }
+ }
+ { \tl_gput_right:Nn \l__phy_mat_line_tl { \l__phy_mat_empty_tl } }
+ % The `&' and `\\' between entries.
+ \int_compare:nNnTF { ####1 } = { \l__phy_mat_dim_int - 1 }
+ {
+ \tl_gput_right:Nn \l__phy_mat_line_tl { \\ }
+ }
+ {
+ \tl_gput_right:Nn \l__phy_mat_line_tl { & }
+ }
+ }
+ \tl_gput_right:Nx \l__phy_diagmat_tl { \l__phy_mat_line_tl }
+ \tl_gclear:N \l__phy_mat_line_tl
+ }
+ \begin { #1 matrix }
+ \tl_use:N \l__phy_diagmat_tl
+ \end { #1 matrix }
+ \group_end:
+ }
+\endinput
+%% End of file `phy-diagmat.sty'.
diff --git a/macros/latex/contrib/physics2/tex/phy-doubleprod.sty b/macros/latex/contrib/physics2/tex/phy-doubleprod.sty
new file mode 100644
index 0000000000..e8981b8aa7
--- /dev/null
+++ b/macros/latex/contrib/physics2/tex/phy-doubleprod.sty
@@ -0,0 +1,40 @@
+%%
+%% This is file `phy-doubleprod.sty',
+%% the `doubleprod' module of `physics2' package.
+%%
+%% ******************************************************
+%% * This work may be distributed and/or modified under *
+%% * the conditions of the LaTeX Project Public License *
+%% * *
+%% * http://www.latex-project.org/lppl.txt *
+%% * *
+%% * either version 1.3c of this license or any later *
+%% * version. *
+%% ******************************************************
+%%
+%% This work has the LPPL maintenance status `maintained'.
+%%
+%% The Current Maintainer of this work is Zhang Tingxuan.
+%%
+\ProvidesFile{phy-doubleprod.sty}
+ [2023/1/25 `doubleprod' (double binary) module of `physics2.sty']
+% The options, true or false.
+\phy@define@key{doubleprod}{crosssymbol}{\def\@phy@dbl@c{#1}}
+\phy@define@key{doubleprod}{dotsymbol}{\def\@phy@dbl@d{#1}}
+\phy@define@key{doubleprod}{crossscale}{\def\@phy@dbl@sc{#1}}
+\phy@define@key{doubleprod}{dotscale}{\def\@phy@dbl@sd{#1}}
+\phy@define@key{doubleprod}{crossopenup}{\def\@phy@dbl@oc{#1}}
+\phy@define@key{doubleprod}{dotopenup}{\def\@phy@dbl@od{#1}}
+\phy@setkeys{doubleprod}{crosssymbol=\times,dotsymbol=\ldotp,
+ crossscale=0.8,dotscale=1,crossopenup=.02,dotopenup=.2}
+\phy@processkeyopt{doubleprod}
+\def\phy@dbl@gen#1#2#3#4{%
+ \DeclareRobustCommand#1{\mathbin{\vcenter{\baselineskip\z@skip%
+ \lineskip#4\phy@dblcurrf@size%
+ \setbox\@tempboxa=\hbox{\fontsize{#2\phy@dblcurrf@size}\z@$#3$}%
+ \copy\@tempboxa\box\@tempboxa}}}}
+\def\phy@dblcurrf@size{\dimexpr\f@size pt\relax}
+\phy@dbl@gen\doublecross\@phy@dbl@sc\@phy@dbl@c\@phy@dbl@oc
+\phy@dbl@gen\doubledot\@phy@dbl@sd\@phy@dbl@d\@phy@dbl@od
+\endinput
+%% End of file `phy-doubleprod.sty'.
diff --git a/macros/latex/contrib/physics2/tex/phy-explsetup.sty b/macros/latex/contrib/physics2/tex/phy-explsetup.sty
new file mode 100644
index 0000000000..e4aa63c752
--- /dev/null
+++ b/macros/latex/contrib/physics2/tex/phy-explsetup.sty
@@ -0,0 +1,29 @@
+%%
+%% This is file `phy-explsetup.sty',
+%% the `explsetup' module of `physics2' package.
+%%
+%% ******************************************************
+%% * This work may be distributed and/or modified under *
+%% * the conditions of the LaTeX Project Public License *
+%% * *
+%% * http://www.latex-project.org/lppl.txt *
+%% * *
+%% * either version 1.3c of this license or any later *
+%% * version. *
+%% ******************************************************
+%%
+%% This work has the LPPL maintenance status `maintained'.
+%%
+%% The Current Maintainer of this work is Zhang Tingxuan.
+%%
+\ProvidesExplFile{phy-explsetup.sty}{2023/1/25}{}
+ {`explsetup' module of `physics2.sty'}
+% temporary variables
+\int_new:N \l__phy_tmpa_int
+\int_new:N \l__phy_tmpb_int
+\tl_new:N \l__phy_tmpa_tl
+\tl_new:N \l__phy_tmpb_tl
+% gobble one token
+\cs_new:Npn \__phy_gobble_i:n #1 { }
+\endinput
+%% End of file `phy-explsetup.sty'.
diff --git a/macros/latex/contrib/physics2/tex/phy-nabla.legacy.sty b/macros/latex/contrib/physics2/tex/phy-nabla.legacy.sty
new file mode 100644
index 0000000000..d5d225afca
--- /dev/null
+++ b/macros/latex/contrib/physics2/tex/phy-nabla.legacy.sty
@@ -0,0 +1,32 @@
+%%
+%% This is file `phy-nabla.legacy.sty',
+%% the `nabla.legacy' module of `physics2' package.
+%%
+%% ******************************************************
+%% * This work may be distributed and/or modified under *
+%% * the conditions of the LaTeX Project Public License *
+%% * *
+%% * http://www.latex-project.org/lppl.txt *
+%% * *
+%% * either version 1.3c of this license or any later *
+%% * version. *
+%% ******************************************************
+%%
+%% This work has the LPPL maintenance status `maintained'.
+%%
+%% The Current Maintainer of this work is Zhang Tingxuan.
+%%
+\ProvidesFile{phy-nabla.legacy.sty}
+ [2023/1/25 `nabla.legacy' (autobraces) module of `physics2.sty']
+\phy@requiremodule{ab}
+% This package required `fixdif' package version 2.x.
+\RequirePackage{fixdif}[2023/01/31]
+\letdif\phy@nl@nabla{nabla}
+\AtBeginDocument{\ifcsname div\endcsname\let\divsymbol\div\fi
+ \DeclareRobustCommand\grad{\phy@nl@nabla\ab}%
+ \DeclareRobustCommand\div{\phy@nl@nabla\cdot\ab}%
+ \DeclareRobustCommand\curl{\phy@nl@nabla\times\ab}%
+ \DeclareRobustCommand\laplacian{\phy@nl@nabla^2\ab}%
+}
+\endinput
+%% End of file `phy-nabla.legacy.sty'.
diff --git a/macros/latex/contrib/physics2/tex/phy-op.legacy.sty b/macros/latex/contrib/physics2/tex/phy-op.legacy.sty
new file mode 100644
index 0000000000..6125f370e3
--- /dev/null
+++ b/macros/latex/contrib/physics2/tex/phy-op.legacy.sty
@@ -0,0 +1,51 @@
+%%
+%% This is file `phy-op.legacy.sty',
+%% the `op.legacy' module of `physics2' package.
+%%
+%% ******************************************************
+%% * This work may be distributed and/or modified under *
+%% * the conditions of the LaTeX Project Public License *
+%% * *
+%% * http://www.latex-project.org/lppl.txt *
+%% * *
+%% * either version 1.3c of this license or any later *
+%% * version. *
+%% ******************************************************
+%%
+%% This work has the LPPL maintenance status `maintained'.
+%%
+%% The Current Maintainer of this work is Zhang Tingxuan.
+%%
+\ProvidesFile{phy-op.legacy.sty}
+ [2023/1/25 `op.legacy' module of `physics2.sty']
+\phy@define@key{op.lega}{ReIm}[true]{\def\phy@reserveda{#1}}
+% The keys for \PV and \pv
+\phy@define@key{op.lega}{PV}{\def\@phy@oplega@PV{#1}}
+\phy@define@key{op.lega}{pv}{\def\@phy@oplega@pv{#1}}
+\phy@setkeys{op.lega}{PV=\mathcal{P},pv={p.v.},ReIm=true}
+\phy@processkeyopt{ab}
+\DeclareRobustCommand\asin{\mathop{\operator@font asin}\nolimits}
+\DeclareRobustCommand\acos{\mathop{\operator@font acos}\nolimits}
+\DeclareRobustCommand\atan{\mathop{\operator@font atan}\nolimits}
+\DeclareRobustCommand\acsc{\mathop{\operator@font acsc}\nolimits}
+\DeclareRobustCommand\asec{\mathop{\operator@font asec}\nolimits}
+\DeclareRobustCommand\acot{\mathop{\operator@font acot}\nolimits}
+\DeclareRobustCommand\Tr{\mathop{\operator@font Tr}\nolimits}
+\DeclareRobustCommand\tr{\mathop{\operator@font tr}\nolimits}
+\DeclareRobustCommand\rank{\mathop{\operator@font rank}\nolimits}
+\DeclareRobustCommand\erf{\mathop{\operator@font erf}\nolimits}
+\DeclareRobustCommand\Res{\mathop{\operator@font Res}\nolimits}
+\DeclareRobustCommand\res{\mathop{\operator@font res}\nolimits}
+\DeclareRobustCommand\PV{\mathord{\@phy@oplega@PV}}
+\DeclareRobustCommand\pv{\mathop{\operator@font\@phy@oplega@pv{}}\nolimits}
+% \Re and \Im, restore the former comands as \Resymbol and \Imsymbol
+\ifx\phy@reserveda\phy@true
+\AtBeginDocument{%
+ \let\Resymbol\Re%
+ \let\Imsymbol\Im%
+ \DeclareRobustCommand\Re{\mathop{\operator@font Re}\nolimits}%
+ \DeclareRobustCommand\Im{\mathop{\operator@font Im}\nolimits}%
+}
+\fi
+\endinput
+%% End of file `phy-op.legacy.sty'.
diff --git a/macros/latex/contrib/physics2/tex/phy-qtext.legacy.sty b/macros/latex/contrib/physics2/tex/phy-qtext.legacy.sty
new file mode 100644
index 0000000000..a6a3162fca
--- /dev/null
+++ b/macros/latex/contrib/physics2/tex/phy-qtext.legacy.sty
@@ -0,0 +1,52 @@
+%%
+%% This is file `phy-qtext.legacy.sty',
+%% the `qtext.legacy' module of `physics2' package.
+%%
+%% ******************************************************
+%% * This work may be distributed and/or modified under *
+%% * the conditions of the LaTeX Project Public License *
+%% * *
+%% * http://www.latex-project.org/lppl.txt *
+%% * *
+%% * either version 1.3c of this license or any later *
+%% * version. *
+%% ******************************************************
+%%
+%% This work has the LPPL maintenance status `maintained'.
+%%
+%% The Current Maintainer of this work is Zhang Tingxuan.
+%%
+\ProvidesFile{phy-qtext.legacy.sty}
+ [2023/1/25 `qtext.legacy' module of `physics2.sty']
+\RequirePackage{amstext}
+\def\phy@qtext@#1#2{#1\text{#2}\quad}
+\DeclareRobustCommand\qqtext{\@ifstar{\phy@qtext@{}}{\phy@qtext@\quad}}
+\DeclareRobustCommand\qq{\qqtext}
+\DeclareRobustCommand\qcomma{,\quad}
+\DeclareRobustCommand\qc{\qcomma}
+\DeclareRobustCommand\qcc{\@ifstar{\phy@qtext@{}{c.c}}{\phy@qtext@\quad{c.c}}}
+\def\phy@qtext@lega@gen@#1{%
+ \expandafter\DeclareRobustCommand\csname q#1\endcsname%
+ {\@ifstar{\phy@qtext@{}{#1}}{\phy@qtext@\quad{#1}}}}
+\phy@qtext@lega@gen@{if}
+\phy@qtext@lega@gen@{then}
+\phy@qtext@lega@gen@{else}
+\phy@qtext@lega@gen@{otherwise}
+\phy@qtext@lega@gen@{unless}
+\phy@qtext@lega@gen@{give}
+\phy@qtext@lega@gen@{using}
+\phy@qtext@lega@gen@{unless}
+\phy@qtext@lega@gen@{assume}
+\phy@qtext@lega@gen@{since}
+\phy@qtext@lega@gen@{let}
+\phy@qtext@lega@gen@{for}
+\phy@qtext@lega@gen@{all}
+\phy@qtext@lega@gen@{even}
+\phy@qtext@lega@gen@{odd}
+\phy@qtext@lega@gen@{integer}
+\phy@qtext@lega@gen@{and}
+\phy@qtext@lega@gen@{or}
+\phy@qtext@lega@gen@{as}
+\phy@qtext@lega@gen@{in}
+\endinput
+%% End of file `phy-qtext.legacy.sty'.
diff --git a/macros/latex/contrib/physics2/tex/phy-xmat.sty b/macros/latex/contrib/physics2/tex/phy-xmat.sty
new file mode 100644
index 0000000000..7a0b2d33d3
--- /dev/null
+++ b/macros/latex/contrib/physics2/tex/phy-xmat.sty
@@ -0,0 +1,148 @@
+%%
+%% This is file `phy-xmat.sty',
+%% the `xmat' module of `physics2' package.
+%%
+%% ******************************************************
+%% * This work may be distributed and/or modified under *
+%% * the conditions of the LaTeX Project Public License *
+%% * *
+%% * http://www.latex-project.org/lppl.txt *
+%% * *
+%% * either version 1.3c of this license or any later *
+%% * version. *
+%% ******************************************************
+%%
+%% This work has the LPPL maintenance status `maintained'.
+%%
+%% The Current Maintainer of this work is Zhang Tingxuan.
+%%
+\ProvidesExplFile{phy-xmat.sty}{2023/1/25}{}
+ {`xmat' module of `physics2.sty'}
+\phy@requiremodule { explsetup }
+\RequirePackage { amsmath }
+\phy@define@key { xmat } { showtop }
+ { \int_gset:Nn \l__phy_xmat_showtop_int { #1 } }
+\phy@define@key { xmat } { showleft }
+ { \int_gset:Nn \l__phy_xmat_showleft_int { #1 } }
+% New variables
+\bool_new:N \l__phy_xmat_extra_vdots_bool
+\bool_new:N \l__phy_xmat_extra_cdots_bool
+\int_new:N \l__phy_xmat_showtop_int
+\int_new:N \l__phy_xmat_showleft_int
+\tl_new:N \l__phy_xmat_tl
+\int_gset:Nn \l__phy_xmat_showtop_int { \value { MaxMatrixCols } - 2 }
+\int_gset:Nn \l__phy_xmat_showleft_int { \value { MaxMatrixCols } - 2 }
+\cs_new:Npn \__phy_xmat_entry_format:nnn #1#2#3
+ {
+ #1 \c_math_subscript_token { #2 #3 }
+ }
+\phy@processkeyopt { xmat }
+\DeclareDocumentCommand \xmat { O{} m m m }
+ { \__phy_xmat_type:nnnnn { } { #1 } { #2 } { #3 } { #4 } }
+\DeclareDocumentCommand \pxmat { O{} m m m }
+ { \__phy_xmat_type:nnnnn { p } { #1 } { #2 } { #3 } { #4 } }
+\DeclareDocumentCommand \bxmat { O{} m m m }
+ { \__phy_xmat_type:nnnnn { b } { #1 } { #2 } { #3 } { #4 } }
+\DeclareDocumentCommand \Bxmat { O{} m m m }
+ { \__phy_xmat_type:nnnnn { B } { #1 } { #2 } { #3 } { #4 } }
+\DeclareDocumentCommand \vxmat { O{} m m m }
+ { \__phy_xmat_type:nnnnn { v } { #1 } { #2 } { #3 } { #4 } }
+\DeclareDocumentCommand \Vxmat { O{} m m m }
+ { \__phy_xmat_type:nnnnn { V } { #1 } { #2 } { #3 } { #4 } }
+
+\keys_define:nn { phy/xmat }
+ {
+ format .cs_set:Np = \__phy_xmat_entry_format:nnn #1#2#3 ,
+ showtop .int_set:N = \l__phy_xmat_showtop_int ,
+ showleft.int_set:N = \l__phy_xmat_showleft_int ,
+ }
+% Use regex to judge if the total row/column number contains digits **only**.
+\prg_new_conditional:Npnn \__phy_if_digits_only:n #1 { TF }
+ {
+ \regex_match:nnTF { \A [[:digit:]]* \Z } { #1 }
+ { \prg_return_true: } { \prg_return_false: }
+ }
+% #1: p,b,B; #2: options; #2: common entry; #3: total rows; #4: total cols.
+\cs_new:Npn \__phy_xmat_type:nnnnn #1#2#3#4#5
+ {
+ \group_begin:
+ \tl_gclear:N \l__phy_xmat_tl
+ \keys_set:nn { phy/xmat } { #2 } %
+ \__phy_if_digits_only:nTF { #4 }
+ {
+ \int_compare:nNnTF { #4 } < { \l__phy_xmat_showtop_int + 1 }
+ {
+ \int_set:Nn \l__phy_xmat_showtop_int { #4 }
+ \bool_set_false:N \l__phy_xmat_extra_vdots_bool
+ }
+ {
+ \bool_set_true:N \l__phy_xmat_extra_vdots_bool
+ }
+ }
+ {
+ \bool_set_true:N \l__phy_xmat_extra_vdots_bool
+ }
+ \__phy_if_digits_only:nTF { #5 }
+ {
+ \int_compare:nNnTF { #5 } < { \l__phy_xmat_showleft_int + 1 }
+ {
+ \int_set:Nn \l__phy_xmat_showleft_int { #5 }
+ \bool_set_false:N \l__phy_xmat_extra_cdots_bool
+ }
+ {
+ \bool_set_true:N \l__phy_xmat_extra_cdots_bool
+ }
+ }
+ {
+ \bool_set_true:N \l__phy_xmat_extra_cdots_bool
+ }
+ \int_step_inline:nn { \l__phy_xmat_showtop_int }
+ {
+ \tl_put_right:Nn \l__phy_xmat_tl
+ { \__phy_xmat_entry_format:nnn { #3 } { ##1 } { 1 } }
+ \int_step_inline:nnn { 2 } { \l__phy_xmat_showleft_int }
+ {
+ \tl_put_right:Nn \l__phy_xmat_tl
+ { & \__phy_xmat_entry_format:nnn { #3 } { ##1 } { ####1 } }
+ }
+ \bool_if:NT \l__phy_xmat_extra_cdots_bool
+ {
+ \tl_put_right:Nn \l__phy_xmat_tl
+ { & \cdots & \__phy_xmat_entry_format:nnn { #3 } { ##1 } { #5 } }
+ }
+ \tl_put_right:Nn \l__phy_xmat_tl { \\ }
+ }
+ \bool_if:NT \l__phy_xmat_extra_vdots_bool
+ {
+ \tl_put_right:Nn \l__phy_xmat_tl { \vdots }
+ \prg_replicate:nn { \l__phy_xmat_showleft_int - 1 }
+ {
+ \tl_put_right:Nn \l__phy_xmat_tl { & \vdots }
+ }
+ % Add \ddots if vdots_bool and cdots_bool be true simultaneously.
+ \bool_if:NT \l__phy_xmat_extra_cdots_bool
+ {
+ \tl_put_right:Nn \l__phy_xmat_tl { & \ddots & \vdots }
+ } % else relax
+ \tl_put_right:Nn \l__phy_xmat_tl { \\ }
+ % The last row.
+ \tl_put_right:Nn \l__phy_xmat_tl
+ { \__phy_xmat_entry_format:nnn { #3 } { #4 } { 1 } }
+ \int_step_inline:nnn { 2 } { \l__phy_xmat_showleft_int }
+ {
+ \tl_put_right:Nn \l__phy_xmat_tl
+ { & \__phy_xmat_entry_format:nnn { #3 } { #4 } { ##1 } }
+ }
+ \bool_if:NT \l__phy_xmat_extra_cdots_bool
+ {
+ \tl_put_right:Nn \l__phy_xmat_tl
+ { & \cdots & \__phy_xmat_entry_format:nnn { #3 } { #4 } { #5 } }
+ }
+ } % else relax
+ \begin { #1 matrix }
+ \tl_use:N \l__phy_xmat_tl
+ \end { #1 matrix }
+ \group_end:
+ }
+\endinput
+%% End of file `phy-xmat.sty'.
diff --git a/macros/latex/contrib/physics2/tex/physics2.sty b/macros/latex/contrib/physics2/tex/physics2.sty
new file mode 100644
index 0000000000..c5ddb08686
--- /dev/null
+++ b/macros/latex/contrib/physics2/tex/physics2.sty
@@ -0,0 +1,70 @@
+%%
+%% This is file `physics2.sty'.
+%%
+%% ******************************************************
+%% * This work may be distributed and/or modified under *
+%% * the conditions of the LaTeX Project Public License *
+%% * *
+%% * http://www.latex-project.org/lppl.txt *
+%% * *
+%% * either version 1.3c of this license or any later *
+%% * version. *
+%% ******************************************************
+%%
+%% This work has the LPPL maintenance status `maintained'.
+%%
+%% The Current Maintainer of this work is Zhang Tingxuan.
+%%
+\NeedsTeXFormat{LaTeX2e}[2020/10/01]
+\ProvidesPackage{physics2}
+ [2023/01/25 Tools for typesetting math for physics.]
+% Some common variables.
+\newcount\phy@tempcnta
+\newdimen\phy@tempdima
+\newdimen\phy@tempdimb
+\newskip\phy@tempskipa
+\newmuskip\phy@tempmuskipa
+\newbox\phy@tempboxa
+\newif\ifphy@tempswa
+\newtoks\phy@toksa
+% The package uses `keyval' to support key-value settings.
+\RequirePackage{keyval}
+\def\phy@true{true}
+\def\phy@false{false}
+% \phy@define@key{<module>}{<key>}[<default value>]{<code>}
+\long\def\phy@define@key#1{\define@key{phy-#1}}
+% \phy@setkeys{<module>}{<key-val list>}
+\long\def\phy@setkeys#1{\setkeys{phy-#1}}
+% \phy@processkeyopt{<module>}
+\def\phy@processkeyopt#1{\let\reserved@a\@empty%
+ \edef\reserved@a{\@ptionlist{\@currname.\@currext}}%
+ \edef\reserved@a{\noexpand\phy@setkeys{#1}{\reserved@a}}%
+ \reserved@a% the next line thanks to `geometry'
+ \AtEndOfPackage{\let\@unprocessedoptions\relax}}
+% Load the physics modules as 2e kernel does.
+\def\usephysicsmodule{\phy@FWoptions\@pkgextension}
+\let\phy@requiremodule\usephysicsmodule
+\@onlypreamble\usephysicsmodule
+\def\phy@FWoptions#1{\@ifnextchar[%]
+ {\phy@FW@ptions#1}{\phy@FW@ptions#1[]}}
+\@onlypreamble\phy@FWoptions
+\def\phy@FW@ptions#1[#2]#3{\@ifnextchar[%]
+ {\phy@FW@pti@ns#1[{#2}]#3}{\phy@FW@pti@ns#1[{#2}]#3[]}}
+\@onlypreamble\phy@FW@ptions
+\def\phy@FW@pti@ns#1[#2]#3[#4]{%
+ \def\reserved@b##1,{%
+ \ifx\@nnil##1\relax\else
+ \ifx\@nnil##1\@nnil\else
+ \noexpand\@onefilewithoptions{phy-##1}[{\unexpanded{#2}}][{#4}]%
+ \noexpand\@pkgextension
+ \fi
+ \expandafter\reserved@b
+ \fi}%
+ \edef\reserved@a{\zap@space#3 \@empty}%
+ \edef\reserved@a{\expandafter\reserved@b\reserved@a,\@nnil,}%
+ \reserved@a}
+\@onlypreamble\phy@FW@pti@ns
+% The `common' module of physics2, every module needs this.
+\phy@requiremodule{common}
+\endinput
+%% End of file `physics2.sty'.