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%%  Die DANTE-Edition
%%  Ein Beispiel der LaTeX Referenz
%%  3. Auflage
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%%  Copyright (C) 2013 Herbert Voss
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%%  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.
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%%  See http://www.latex-project.org/lppl.txt for details.
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\documentclass[]{examargin}
\pagestyle{empty}
\setlength\textwidth{352.81416pt}
\setlength\parindent{0pt}
%StartShownPreambleCommands
\usepackage{amsmath}
%StopShownPreambleCommands
\begin{document}
\begin{flalign}
i_{11}&= 0.25               & i_{12} &= i_{21}       & i_{13} &= i_{23}\nonumber \\
i_{21}&= \frac{1}{3}\,i_{11}& i_{22} &= 0.5\,i_{12}  & i_{23} &= i_{31}
\end{flalign}
\end{document}