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%%  Ein Beispiel der DANTE-Edition
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%%  2. Auflage
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%%  Beispiel 09-07-29 auf Seite 429.
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%%  Copyright (C) 2016 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[]{exaarticle}
\pagestyle{empty}
\setlength\textwidth{352.81416pt}
\AtBeginDocument{\setlength\parindent{0pt}}
\setcounter{equation}{53}
\renewcommand\theequation{9.\arabic{equation}}
%StartShownPreambleCommands
\usepackage{amsmath,array}
%StopShownPreambleCommands
\begin{document}
\begin{align} \setlength\delimitershortfall{-1pt}
\underline{A} &amp;= \left[\begin{array}{*7c}
    a_{11} &amp; a_{12} &amp; 0 &amp; \ldots &amp; \ldots &amp; \ldots &amp; 0\\
    a_{21} &amp; a_{22} &amp; a_{23} &amp; 0 &amp; \ldots &amp; \ldots &amp; 0\\
    0 &amp; a_{32} &amp; a_{33} &amp; a_{34} &amp; 0 &amp; \ldots &amp; 0\\
    \vdots &amp; \vdots &amp; \vdots &amp; \vdots &amp; \vdots &amp; \vdots &amp; \vdots\\
    \hdotsfor{7}\\
    \vdots &amp; \vdots &amp; \vdots &amp; \vdots &amp; \vdots &amp; \vdots &amp; \vdots\\
    0 &amp; \ldots &amp; 0 &amp; a_{n-2,n-3} &amp; a_{n-2,n-2} &amp; a_{n-2,n-1} &amp; 0\\
    0 &amp; \ldots &amp; \ldots &amp; 0 &amp; q_{n-1,n-2} &amp; a_{n-1,n-1} &amp; a_{n-1,n}\\
    0 &amp; \ldots &amp; \ldots &amp; \ldots &amp; 0 &amp; a_{n,n-1} &amp; a_{nn}
  \end{array}\right]
\end{align}
\end{document}
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