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%% start of file `old-arrows.tex'.
%% Copyright 2015 Riccardo Dossena (riccardo.dossena@gmail.com).
%
% This work may be distributed and/or modified under the
% conditions of the LaTeX Project Public License version 1.3c,
% available at http://www.latex-project.org/lppl/.
%%
% !TEX encoding = UTF-8
% !TEX program = pdflatex
\documentclass[11pt]{ltxdoc}

\usepackage[english]{babel}
\usepackage{amsmath,amssymb,amsthm}
\usepackage[shortlabels]{enumitem}
\usepackage[new]{old-arrows}
\usepackage[margin=3.3cm,footskip=20pt]{geometry}
\usepackage[colorlinks=true]{hyperref}
\usepackage[all]{hypcap} % needed to help hyperlinks direct correctly;

\def\fileversion{1.0}
\def\filedate{August 15, 2015}

%Logo per MiKTeX e TeXLive
\newcommand{\MiKTeX}{MiK\TeX}
\newcommand{\TeXLive}{\mbox{\TeX\ Live}}
%
%
% Symbol Entry for Math Symbol Tables
%
\newcommand{\X}[1]{$#1$&\texttt{\string#1}\hspace*{1ex}}

\newcommand{\W}[2]{$#1{#2}$&
  \texttt{\string#1}\texttt{\string{\string#2\string}}\hspace*{1ex}}

\theoremstyle{remark}
\newtheorem*{remark}{Remark}

% Mathsymbol Table
\newsavebox{\symbbox}
\newenvironment{symbols}[1]%
{\par\vspace*{2ex}
\renewcommand{\arraystretch}{1.1}
\begin{lrbox}{\symbbox}
\hspace*{4ex}\begin{tabular}{@{}#1@{}}}%
{\end{tabular}\end{lrbox}\makebox[\textwidth]{\usebox{\symbbox}}\par\medskip}

%Per l'esempio senza amsmath
\makeatletter
\def\overrightfreccia#1{\vbox{\m@th\ialign{##\crcr
      \rightfrecciafill\crcr\noalign{\kern-\p@\nointerlineskip}
      $\hfil\displaystyle{#1}\hfil$\crcr}}}
\def\overleftfreccia#1{\vbox{\m@th\ialign{##\crcr
      \leftfrecciafill\crcr\noalign{\kern-\p@\nointerlineskip}%
      $\hfil\displaystyle{#1}\hfil$\crcr}}}
\def\varoverrightfreccia#1{\vbox{\m@th\ialign{##\crcr
      \varrightfrecciafill\crcr\noalign{\kern-\p@\nointerlineskip}
      $\hfil\displaystyle{#1}\hfil$\crcr}}}
\def\varoverleftfreccia#1{\vbox{\m@th\ialign{##\crcr
      \varleftfrecciafill\crcr\noalign{\kern-\p@\nointerlineskip}%
      $\hfil\displaystyle{#1}\hfil$\crcr}}}
\def\rightfrecciafill{$\m@th\smash-\mkern-7mu%
  \cleaders\hbox{$\mkern-2mu\smash-\mkern-2mu$}\hfill
  \mkern-7mu\mathord\rightarrow$}
\def\leftfrecciafill{$\m@th\mathord\leftarrow\mkern-7mu%
  \cleaders\hbox{$\mkern-2mu\smash-\mkern-2mu$}\hfill
  \mkern-7mu\smash-$}
\def\varrightfrecciafill{$\m@th\smash-\mkern-7mu%
  \cleaders\hbox{$\mkern-2mu\smash-\mkern-2mu$}\hfill
  \mkern-7mu\mathord\varrightarrow$}
\def\varleftfrecciafill{$\m@th\mathord\varleftarrow\mkern-7mu%
  \cleaders\hbox{$\mkern-2mu\smash-\mkern-2mu$}\hfill
  \mkern-7mu\smash-$}
\makeatother

\begin{document}

\title{The \textsf{old-arrows} package}
\author{Riccardo Dossena\thanks{%
E-mail: \href{mailto:riccardo.dossena@gmail.com}{\tt riccardo.dossena@gmail.com}}}
\date{Version \fileversion, released on \filedate}

\maketitle

\begin{abstract}
This package provides Computer Modern old-style arrows ($\rightarrow$) with smaller arrowheads, associated with
ordinary \LaTeX\ commands. It can be used in a document that contains
other \texttt{amsmath} arrow characters, like $\twoheadrightarrow$, that also have small
arrowheads. It is possible to use the usual new-style Computer Modern arrows ($\varrightarrow$) together with the old-style ones.
\end{abstract}

\tableofcontents

\section{Introduction}

In 1992, Donald E. Knuth made some important corrections to Computer Modern fonts\footnote{See \url{http://www-cs-faculty.stanford.edu/~uno/cm.html}}. As a consequence, the characters corresponding to arrows have been modified. Just to make things clearer,
\[
A \to B
\]
became
\[
A \varto B
\]
 that is, the character $\to$ was replaced by $\varto$, that has a larger arrowhead. The same happened to other arrow characters. However, many arrow characters defined by \texttt{amssymb}, like $\nrightarrow$, $\rightarrowtail$, $\twoheadrightarrow$ and others, maintained a small arrowhead and seem too different from $\varto$.

The \texttt{old-arrows} package with Old Arrows font family allows to use the old-style arrows $\to$, $\gets$~\ldots, with the traditional commands \verb|\rightarrow|, \verb|\leftarrow|\ldots\ Furthermore, the option \texttt{new} allows to obtain simultaneously the new-style arrows $\varto$, $\vargets$ \ldots, just placing  \verb|\var| before the corresponding commands (e.g.,~\verb|\varrightarrow|, \verb|\varleftarrow|\ldots).

Old Arrows font family was derived from an old version of Blue Sky Computer Modern Math Symbols (1991--1992, released by AMS) by deleting many characters with FontForge.

\section{Licenses}

The \LaTeX\ code in this package is licensed under the \LaTeX\ Project Public License, v1.3.

The fonts in this package are licensed under the SIL Open Font License, v1.1.

\section{Installation}

\subsection{Copying the files in the local \texttt{texmf} tree}

The Old Arrows fonts files are:

\begin{center}
\begin{tabular}{p{3cm}p{3cm}p{3cm}l}
\hline
\texttt{oasy5.afm}   & \texttt{oasy5.pfm}   & \texttt{oasy5.tfm}   &  \texttt{oasy5.pfb}   \\
\texttt{oasy6.afm}   & \texttt{oasy6.pfm}   & \texttt{oasy6.tfm}   &  \texttt{oasy6.pfb}   \\
\texttt{oasy7.afm}   & \texttt{oasy7.pfm}   & \texttt{oasy7.tfm}   &  \texttt{oasy7.pfb}   \\
\texttt{oasy8.afm}   & \texttt{oasy8.pfm}   & \texttt{oasy8.tfm}   &  \texttt{oasy8.pfb}   \\
\texttt{oasy9.afm}   & \texttt{oasy9.pfm}   & \texttt{oasy9.tfm}   &  \texttt{oasy9.pfb}   \\
\texttt{oasy10.afm}  & \texttt{oasy10.pfm}  & \texttt{oasy10.tfm}  &  \texttt{oasy10.pfb}  \\
\texttt{oabsy5.afm}  & \texttt{oabsy5.pfm}  & \texttt{oabsy5.tfm}  &  \texttt{oabsy5.pfb}  \\
                     &                      & \texttt{oabsy6.tfm}  &                       \\
\texttt{oabsy7.afm}  & \texttt{oabsy7.pfm}  & \texttt{oabsy7.tfm}  &  \texttt{oabsy7.pfb}  \\
                     &                      & \texttt{oabsy8.tfm}  &                       \\
                     &                      & \texttt{oabsy9.tfm}  &                       \\
\texttt{oabsy10.afm} & \texttt{oabsy10.pfm} & \texttt{oabsy10.tfm} &  \texttt{oabsy10.pfb} \\
\hline
\end{tabular}
\end{center}

These files were derived from Computer Modern fonts \texttt{cmbsy5}, \texttt{cmbsy7}, \texttt{cmbsy10}, \texttt{cmsy5}, \texttt{cmsy7}, \texttt{cmsy8}, \texttt{cmsy9} and \texttt{cmsy10}.

Call \texttt{<localtexmf>} the path of your local \texttt{texmf} tree. For \TeXLive, the local tree is usually placed in \texttt{/usr/local/texlive/texmf-local}; for \MiKTeX, it can be set up on any directory, by the \textsf{Roots} tab of ``\MiKTeX\ Options''.

\begin{enumerate}
\item Copy the \texttt{*.afm} and \texttt{*.tfm} font files into the corresponding \texttt{old-arrows} directories (you have to create them, as shown below):
    \begin{verbatim}
    <localtexmf>/fonts/afm/old-arrows
    <localtexmf>/fonts/tfm/old-arrows
    \end{verbatim}

\item Copy the \texttt{*.pfb} and \texttt{*.pfm} font files into the directory
    \begin{verbatim}
    <localtexmf>/fonts/type1/old-arrows
    \end{verbatim}

\item Copy the \texttt{oasy.enc} and \texttt{oasy.map} files, respectively, into the directories
    \begin{verbatim}
    <localtexmf>/fonts/enc/dvips/old-arrows
    <localtexmf>/fonts/map/dvips/old-arrows
    \end{verbatim}

\item Copy the \texttt{old-arrows.sty} file into the directory
    \begin{verbatim}
    <localtexmf>/tex/latex/old-arrows
    \end{verbatim}
\end{enumerate}

\subsection{Updating the filename database}\label{agg-database-file}

\begin{description}[font=\bfseries\sffamily, leftmargin=5em, style=sameline]
\item[\MiKTeX] On the \textsf{General} tab of ``MiKTeX Options (Admin)'' click the \textsf{Refresh~FNDB} button. Alternatively, in a DOS command prompt window run
    \begin{verbatim}
    initexmf --update-fndb
    \end{verbatim}

\item[\TeXLive] Start the ``\TeXLive\ Manager''. From \textsf{Actions} menu, select \textsf{Update filename database}. Alternatively, run in a terminal command line
    \begin{verbatim}
    mktexlsr
    \end{verbatim}
\end{description}

\subsection{Updating the font map files}

\begin{description}[font=\bfseries\sffamily, leftmargin=5em, style=sameline]
\item[\MiKTeX]
To update the configuration file \texttt{updmap.cfg}, execute in a DOS command prompt
\begin{verbatim}
    initexmf --edit-config-file updmap
\end{verbatim}
add to \texttt{updmap.cfg} (that will be opened) the following line
\begin{verbatim}
    Map oasy.map
\end{verbatim}
save, close and execute (always in the DOS command prompt)
\begin{verbatim}
    initexmf --mkmaps
\end{verbatim}

\item[\TeXLive]
Execute in a terminal command line
\begin{verbatim}
    updmap-sys --enable Map=oasy.map
\end{verbatim}
\end{description}
Finally, it is better to make another update of the filename database (see~\ref{agg-database-file}).

\section{Usage}

\subsection{Basic usage}

Simply type in the preamble of your \LaTeX\ document
\begin{verbatim}
    \usepackage{old-arrows}
\end{verbatim}
and every arrow command will be associated to the ``old-style'', as indicated in table~\ref{tab-frecce-vecchie}.

\begin{table}[!htbp]
\begin{symbols}{*3{cl}}
 \X{\leftarrow}or \verb|\gets|& \X{\longleftarrow}     & \X{\uparrow}          \\
 \X{\rightarrow}or \verb|\to|& \X{\longrightarrow}    & \X{\downarrow}        \\
 \X{\leftrightarrow}    & \X{\longleftrightarrow}& \X{\updownarrow}      \\
 \X{\mapsto}            & \X{\longmapsto}        & \X{\nearrow}          \\
 \X{\hookleftarrow}     & \X{\hookrightarrow}    & \X{\searrow}          \\
 \X{\leftharpoonup}     & \X{\rightharpoonup}    & \X{\swarrow}          \\
 \X{\leftharpoondown}   & \X{\rightharpoondown}  & \X{\nwarrow}          \\
\end{symbols}
\caption{Old-style arrows, provided by \texttt{old-arrows}.}\label{tab-frecce-vecchie}
\end{table}

\subsection{Usage together with \texttt{amsmath} and \texttt{lmodern} packages}

The \texttt{old-arrows} package does not require \texttt{amsmath}. However, if you want to use the \texttt{amsmath} package, you must load it \emph{before} \texttt{old-arrows}:
\begin{verbatim}
    \usepackage{amsmath}
    \usepackage{old-arrows}
\end{verbatim}
Moreover, \texttt{old-arrows} is fully compatible with the Latin Modern fonts, always provided that you load the \texttt{lmodern} package \emph{before} \texttt{old-arrows}:
\begin{verbatim}
    \usepackage{lmodern}
    \usepackage{amsmath}
    \usepackage{old-arrows}
\end{verbatim}

\begin{remark}
It is very important that you load \texttt{old-arrows} \emph{after} \texttt{amsmath} and \texttt{lmodern}, because \texttt{old-arrows} redefines many commands provided by these packages. Otherwise, \texttt{old-arrows} won't work properly.
\end{remark}

The \texttt{amsmath} package makes other over, under (table~\ref{tab-frecce-vecchie-amsmath}) and extensible arrows (table~\ref{tab-frecce-vecchie-ext}) available. Note that \texttt{amsmath} adds more space between the arrow and the characters, with a better typographical result. The commands \verb|\overrightarrow{AB}| and \verb|\overlefttarrow{AB}|, without \texttt{amsmath}, produce respectively
\[
\overrightfreccia{AB} \,\text{ rather than }\, \overrightarrow{AB} \qquad \text{and} \qquad \overleftfreccia{AB} \,\text{ rather than }\, \overleftarrow{AB}.
\]
The commands \verb|\rightarrowfill| and \verb|\leftarrowfill| allow to fill empty spaces with extensible arrows. For example, the first command at the end of this line gives \rightarrowfill

\begin{table}[!htbp]
\begin{symbols}{*3{cl}}
 \W{\overleftarrow}{AB} & \W{\underleftarrow}{AB}    \\
 \W{\overrightarrow}{AB} & \W{\underrightarrow}{AB}  \\
 \W{\overleftrightarrow}{AB} & \W{\underleftrightarrow}{AB} \\
\end{symbols}
\caption{Old-style over and under arrows provided by \texttt{amsmath}.}\label{tab-frecce-vecchie-amsmath}
\end{table}
\begin{table}[!htbp]
\begin{symbols}{*2{cl}}
 \W{\xleftarrow}{ABCDEF} & \W{\xrightarrow}{ABCDEF}          \\
\end{symbols}
\caption{Old-style extensible arrows provided by \texttt{amsmath}.}\label{tab-frecce-vecchie-ext}
\end{table}

Finally, the \texttt{amsmath} package provides the command \verb|\boldsymbol| that allows bold mathematical symbols, which can be used together with \texttt{old-arrows}. For example, the commands
\begin{center}
    \verb|$\boldsymbol{A \to B}$| \quad and \quad \verb|$\boldsymbol{\overrightarrow{AB}}$|
\end{center}
produce $\boldsymbol{A \to B}$ and $\boldsymbol{\overrightarrow{AB}}$, respectively.

\subsection{The option \textsf{new}}

Loading \texttt{old-arrows} with the option \texttt{new}
\begin{verbatim}
    \usepackage[new]{old-arrows}
\end{verbatim}
allows to use the new-style and the old-style arrows simultaneously. In order to obtain new-style arrows, just put \verb|\var| before every ordinary command, as shown in tables~\ref{tab-frecce-nuove}, \ref{tab-frecce-nuove-amsmath} and \ref{tab-frecce-nuove-ext}.

\begin{table}[!htbp]
\begin{symbols}{*3{cl}}
 \X{\varleftarrow}or \verb|\vargets|& \X{\varlongleftarrow}     & \X{\varuparrow}          \\
 \X{\varrightarrow}or \verb|\varto|& \X{\varlongrightarrow}    & \X{\vardownarrow}        \\
 \X{\varleftrightarrow}    & \X{\varlongleftrightarrow}& \X{\varupdownarrow}      \\
 \X{\varmapsto}            & \X{\varlongmapsto}        & \X{\varnearrow}          \\
 \X{\varhookleftarrow}     & \X{\varhookrightarrow}    & \X{\varsearrow}          \\
 \X{\leftharpoonup}     & \X{\rightharpoonup}    & \X{\varswarrow}          \\
 \X{\leftharpoondown}   & \X{\rightharpoondown}  & \X{\varnwarrow}          \\
\end{symbols}
\caption{New-style arrows provided by option \texttt{new}.}\label{tab-frecce-nuove}
\end{table}
\begin{table}[!htbp]
\begin{symbols}{*2{cl}}
 \W{\varoverleftarrow}{AB} & \W{\varunderleftarrow}{AB}    \\
 \W{\varoverrightarrow}{AB} & \W{\varunderrightarrow}{AB}  \\
 \W{\varoverleftrightarrow}{AB} & \W{\varunderleftrightarrow}{AB} \\
\end{symbols}
\caption{New-style over and under arrows provided by \texttt{amsmath} and the option \texttt{new} of \texttt{old-arrows}.}
\label{tab-frecce-nuove-amsmath}
\end{table}
\begin{table}[!htbp]
\begin{symbols}{*2{cl}}
 \W{\varxleftarrow}{ABCDEF} & \W{\varxrightarrow}{ABCDEF}          \\
\end{symbols}
\caption{New-style extensible arrows provided by \texttt{amsmath} and the option \texttt{new} of \texttt{old-arrows}.}
\label{tab-frecce-nuove-ext}
\end{table}

%\pagebreak

Note that the commands
\begin{center}
\verb|\leftharpoonup|, \verb|\rightharpoonup|, \verb|\leftharpoondown|, \verb|\rightharpoondown|
\end{center}
have not been redefined by \texttt{old-arrows}, because the corresponding characters $\leftharpoonup,\rightharpoonup,\leftharpoondown,\rightharpoondown$ have not been modified by the introduction of the new-style arrows.

The commands \verb|\varrightarrowfill| and \verb|\varleftarrowfill| allow to fill empty spaces with extensible arrows. The first command at the end of this line gives \varrightarrowfill

Finally, even with the option \texttt{new} it is possibile to use the command \verb|\boldsymbol| provided by \texttt{amsmath}. The following commands
\begin{center}
    \verb|$\boldsymbol{A \varto B}$| \quad and \quad \verb|$\boldsymbol{\varoverrightarrow{AB}}$|
\end{center}
produce $\boldsymbol{A \varto B}$ and $\boldsymbol{\varoverrightarrow{AB}}$ respectively.

\end{document}