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+%%
+%% Ein Beispiel der DANTE-Edition
+%%
+%% 2. Auflage
+%%
+%% Beispiel 09-07-42 auf Seite 435.
+%%
+%% Copyright (C) 2016 Herbert Voss
+%%
+%% It may be distributed and/or modified under the conditions
+%% of the LaTeX Project Public License, either version 1.3
+%% of this license or (at your option) any later version.
+%%
+%% See http://www.latex-project.org/lppl.txt for details.
+%%
+%%
+%% ====
+% Show page(s) 1
+%%
+%%
+\documentclass[]{exaarticle}
+\pagestyle{empty}
+\setlength\textwidth{352.81416pt}
+\AtBeginDocument{\setlength\parindent{0pt}}
+\setcounter{equation}{59}
+\renewcommand\theequation{9.\arabic{equation}}
+%StartShownPreambleCommands
+\usepackage{amsmath} \makeatletter \let\oldTagForm\tagform@
+\renewcommand\tagform@[1]{\maketag@@@{\ignorespaces*#1*\unskip\@@italiccorr}}
+\makeatother
+%StopShownPreambleCommands
+\begin{document}
+\begin{align}
+ c^2 &\le a^2 + b^2\label{eq:pyth0}\\
+ \left|\sum_{i=1}^n a_ib_i\right| &\le \left(\sum_{i=1}^n a_i^2\right)^{1/2}
+ \left(\sum_{i=1}^n b_i^2\right)^{1/2}\label{eq:pyth1}
+\end{align}
+\makeatletter\let\tagform@\oldTagForm\makeatother
+\begin{align}\label{eq:pyth2} c^2 &\le a^2 + b^2 \end{align}
+
+Eine Referenz auf Gl.~\eqref{eq:pyth0}, auf Gl.~\eqref{eq:pyth1} und
+auf Gl.~\eqref{eq:pyth2}.
+\end{document}