%% 
%%  Ein Beispiel der DANTE-Edition
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%%  2. Auflage
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%%  Beispiel 09-07-15 auf Seite 422.
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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.
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% Show page(s) 1
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\documentclass[]{exaarticle}
\pagestyle{empty}
\setlength\textwidth{193.16928pt}
\AtBeginDocument{\setlength\parindent{0pt}}
\setcounter{equation}{42}
\renewcommand\theequation{9.\arabic{equation}}
%StartShownPreambleCommands
\usepackage{amsmath}
%StopShownPreambleCommands
\begin{document}
\begin{gather}\label{eq:gather}
\begin{gathered}
 i_{11}=0.25\\ i_{21}=\frac{1}{3}i_{11}\\
 i_{31}=0.33i_{22}\\ i_{41}=i_{11}+i_{22}
\end{gathered}
\end{gather}
%
Eine Referenz auf Gl.~\eqref{eq:gather}.
\end{document}
