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%%  Ein Beispiel der DANTE-Edition
%%  Mathematiksatz mit LaTeX
%%  3. Auflage
%%  Beispiel 06-20-2 auf Seite 132.
%%  Copyright (C) 2018 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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\documentclass[10pt]{screxa}
\pagestyle{empty}
\setlength\textwidth{352.81416pt}
\AtBeginDocument{\setlength\parindent{0pt}}
\setcounter{equation}{79}
\renewcommand\theequation{6.\arabic{equation}}
%StartShownPreambleCommands
\usepackage{amsmath}
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\begin{document}
\begin{xalignat}{3}
 i_{11} &amp; =0.25 &amp; i_{12} &amp; =i_{21} &amp; i_{13} &amp; =i_{23}\nonumber \\
 i_{21} &amp; =\frac{1}{3}i_{11} &amp; i_{22} &amp; =0.5i_{12} &amp; i_{23} &amp; =i_{31}\\
 i_{31} &amp; =0.33i_{22} &amp; i_{32} &amp; =0.15i_{32} &amp; i_{33} &amp; =i_{11}
\end{xalignat}
\end{document}
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