%% 
%%  Ein Beispiel der DANTE-Edition
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%%  2. Auflage
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%%  Beispiel 09-03-5 auf Seite 383.
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%%  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
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\documentclass[]{exaarticle}
\pagestyle{empty}
\setlength\textwidth{145.16928pt}
\setlength\parindent{0pt}
\setcounter{equation}{3}
\renewcommand\theequation{9.\arabic{equation}}
%StartShownPreambleCommands
\newenvironment{gl}{\equation}{\endequation}
\newenvironment{gl*}
  {\equation\scriptstyle}{\endequation}
%StopShownPreambleCommands
\begin{document}
\begin{gl} f(x)=\int\frac{\sin x}{x}\,
  \mathrm{d}x\end{gl}
\begin{gl*}f(x)=\int\frac{\sin x}{x}\,
  \mathrm{d}x\end{gl*}
\end{document}
