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\documentclass{article}
\usepackage{amsmath}
\usepackage[hypertexnames=false]{hyperref}
\usepackage{cleveref}
\usepackage{autonum}
\newcounter{Hequation}
\renewcommand{\theHequation}{\thechapter.\arabic{Hequation}}
\makeatletter
\g@addto@macro\equation{\stepcounter{Hequation}}
\makeatother
\begin{document}
% \tracingall
% \makeatletter
% \show\equation
% \show\autonum@equationOld
% \show\mathdisplay
% \show\mathdisplay@pop
% \begin{equation}\label{dd}a\end{equation}%\ref{dd}
% % \stop
% \begin{equation}\label{ee}b\end{equation}
\section*{Tests}
\begin{itemize}
\item Having a referenced equation with reference before \ref{referenceBefore}
\begin{equation}\label{referenceBefore}
d - d = 0
\end{equation}
\begin{equation}\label{referenceNo}
d - d = 0
\end{equation}
\ref{b}\begin{equation}\label{a}a\end{equation}\begin{equation}\label{b}b\end{equation}
\item Having a referenced equation with reference after
\begin{equation}\label{referenceAfter}
c^2 = c c
\end{equation}
\ref{referenceAfter}
\item Having an unlabeled equation
\begin{equation}\label{abc}
a^2 + b^2 = c^2
\end{equation}
\item Having a labeled, but unreferenced equation
\begin{equation}\label{unreferenced}
\sqrt{a}
\end{equation}
\item Having a labeled equation with a very strange label \ref{äöüÄÖÜß?:, 3075µ!/§}
\begin{equation}\label{äöüÄÖÜß?:, 3075µ!/§}
\sqrt{b}
\end{equation}
\item Check for spurious whitespace around reference (\ref{checkWhitespace})
\begin{equation}\label{checkWhitespace}
b_c
\end{equation}
\item Placing the number in long equations \ref{long}
\begin{equation}\label{long}
\sum\sum\sum\sum\sum\sum\sum\sum\sum\sum\sum\sum\sum\sum\sum\sum\sum\sum\sum a
\end{equation}
\item Printing the number without referencing
\begin{equation+}
E = mgh
\end{equation+}
\item Using a ref inside a caption
\begin{figure}
ref
\caption{\ref{long}}
\end{figure}
\item Using a cref inside a caption
\begin{figure}
cref
\caption{\cref{long}}
\end{figure}
\item Using cref with one argument
\begin{equation}\label{crefOne}
g
\end{equation}
\cref{crefOne}
\item Using cref with two arguments
\begin{equation}\label{crefTwo}
cr = ef
\end{equation}
\cref{crefOne,crefTwo}
\item Using otherwise unused cref with two arguments
\[\label{crefThree}
cr = ef
\]
\[\label{crefFour}
cr = ef
\]
\cref{crefThree,crefFour}
\item Using align \ref{alignOne}, \ref{alignThree}
\begin{align}
a\label{alignOne}\\
b\label{alignTwo}\\
c\label{alignThree}
\end{align}
\item Using gather \ref{gatherOne}, \ref{gatherThree}
\begin{gather}
a\label{gatherOne}\\
b\label{gatherTwo}\\
c\label{gatherThree}
\end{gather}
\item Using multline without referencing
\begin{multline}
a\\
c\label{multlineUnreferenced}
\end{multline}
\item Using multline with referencing \ref{multlineReferenced}
\begin{multline}
a\\
c\label{multlineReferenced}
\end{multline}
\item Using flalign with referencing \ref{flalignReferenced}
\begin{flalign}
a\\
c\label{flalignReferenced}
\end{flalign}
\item Using alignat with referencing \ref{alignatReferenced}
\begin{alignat}{4}
x &= yy & \implies & y &= x \label{alignatUnreferenced}\\
y &= z & \implies & z &= y \label{alignatReferenced}
\end{alignat}
\item short one-line shortcut \[n\]
% \item shortcut environment with two lines, referencing \ref{firstShortcut} \[n_1\label{firstShortcut} \\ n_2\]
\item align, numbering always \begin{align+} a=l \end{align+}
\item gather, numbering always \begin{gather+} g=a \end{gather+}
\item multline, numbering always (and avoiding overfull hbox warning) \begin{multline+} m=u\line(1,0){220}=v \end{multline+}
\item equation, numbering always \begin{equation+} e=q \end{equation+}
\item shortcut and split \ref{split} \[ \label{split}\begin{split} s \\ p \end{split} \]
\item equation and split \ref{splitEquation} \begin{equation} \label{splitEquation}\begin{split} s \\ p \end{split} \end{equation}
% \item super-short \[\(a+b\\d+e\)\]
% \item Using aligned \ref{alignedOne}, \ref{alignedThree}
% \begin{equation}
% \begin{aligned}
% a\label{alignedOne}\\
% b\label{alignedTwo}\\
% c\label{alignedThree}
% \end{aligned}
% \end{equation}
% \item Using gathered \ref{gatheredOne}, \ref{gatheredThree}
% \begin{equation}
% \begin{gathered}
% a\label{gatheredOne}\\
% b\label{gatheredTwo}\\
% c\label{gatheredThree}
% \end{gathered}
% \end{equation}
\end{itemize}
\section{Using ref in section \ref{i1}}\label{i1} text
\section{Using cref in \cref{i2}}\label{i2} text
\begin{figure}
\caption{Ref 2: \cref{i2} and \ref{i2}}
\end{figure}
\tableofcontents
\listoffigures
\end{document}
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