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+%%
+%% Ein Beispiel der DANTE-Edition
+%% Mathematiksatz mit LaTeX
+%% 2. Auflage
+%%
+%% Beispiel 09-16-7 auf Seite 195.
+%%
+%% Copyright (C) 2012 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}{15}
+\renewcommand\theequation{9.\arabic{equation}}
+\StartShownPreambleCommands
+\usepackage{gauss,fleqn}\renewcommand\rowmultlabel[1]{|\,\cdot#1}
+\StopShownPreambleCommands
+\begin{document}
+\begin{equation}
+ \begin{gmatrix}[p]
+ 1 &-2 & 1 & 2 \\ 2 & 3 &-2 & 3 \\ % Zeile 0 und 1
+ 4 &-1 & 3 &-1 \\ 3 & 2 &-4 & 5 % 2 und 3
+ \rowops
+ \mult{0}{(-2)} \add{0}{1} \mult{0}{(-4)}\add{0}{2} \mult{0}{(-3)} \add{0}{3}
+ \end{gmatrix}
+\end{equation} % Ende 1. Matrix
+\begin{equation}
+ \begin{gmatrix}[p]
+ 1 &-2 & 1 & 2 \\ 0 & 7 &-4 &-1 \\% Zeile 0 und 1
+ 0 & 7 &-1 &-9 \\ 0 & 8 &-7 &-1 % 2 und 3
+ \rowops
+ \mult{1}{(-1)} \add{1}{2} \mult{1}{(-\frac{8}{7})} \add{1}{3}
+ \end{gmatrix}
+\end{equation}
+\end{document}