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+%% 
+%%  Ein Beispiel der DANTE-Edition
+%%  
+%%  2. Auflage
+%% 
+%%  Beispiel 09-07-29 auf Seite 429.
+%% 
+%%  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.
+%% 
+%% 
+%% ==== 
+% Show page(s) 1
+%% 
+%% 
+\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} &= \left[\begin{array}{*7c}
+    a_{11} & a_{12} & 0 & \ldots & \ldots & \ldots & 0\\
+    a_{21} & a_{22} & a_{23} & 0 & \ldots & \ldots & 0\\
+    0 & a_{32} & a_{33} & a_{34} & 0 & \ldots & 0\\
+    \vdots & \vdots & \vdots & \vdots & \vdots & \vdots & \vdots\\
+    \hdotsfor{7}\\
+    \vdots & \vdots & \vdots & \vdots & \vdots & \vdots & \vdots\\
+    0 & \ldots & 0 & a_{n-2,n-3} & a_{n-2,n-2} & a_{n-2,n-1} & 0\\
+    0 & \ldots & \ldots & 0 & q_{n-1,n-2} & a_{n-1,n-1} & a_{n-1,n}\\
+    0 & \ldots & \ldots & \ldots & 0 & a_{n,n-1} & a_{nn}
+  \end{array}\right]
+\end{align}
+\end{document}