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+%%
+%% An UIT Edition example
+%%
+%% Example 06-06-2 on page 99.
+%%
+%% Copyright (C) 2010 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{375.57637pt}
+\AtBeginDocument{\setlength\parindent{0pt}}
+\setcounter{equation}{48}
+\renewcommand\theequation{6.\arabic{equation}}
+\StartShownPreambleCommands
+\usepackage{amsmath,array}
+\StopShownPreambleCommands
+\begin{document}
+\setlength\delimitershortfall{-1pt}
+\begin{align}
+\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}