<html><head><meta name="color-scheme" content="light dark"></head><body><pre style="word-wrap: break-word; white-space: pre-wrap;">%% 
%%  An UIT Edition example
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%%  Example 10-01-2 on page 198.
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%%  Copyright (C) 2010 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.
%% 
%%  See http://www.latex-project.org/lppl.txt for details.
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\documentclass[]{exaarticle}
\pagestyle{empty}
\setlength\textwidth{375.57637pt}
\AtBeginDocument{\setlength\parindent{0pt}}
\StartShownPreambleCommands

\StopShownPreambleCommands
\begin{document}
\[ \begin{array}{l@{\,=\,}*{5}{l@{\,+\,}}l}
y_1 &amp; x_{11} &amp; x_{12} &amp; x_{13} &amp; \dots &amp; x_{1(n-1)} &amp; x_{1n} \\
y_2 &amp; x_{21} &amp; x_{22} &amp; x_{23} &amp; \dots &amp; x_{2(n-1)} &amp; x_{2n} \\
\ \vdots &amp;\ \vdots &amp;\ \vdots &amp;\ \vdots &amp;\ \ddots &amp;\ \vdots &amp;\ \vdots\\
y_{n-1} &amp; x_{(n-1)1} &amp; x_{(n-1)2} &amp; x_{(n-1)3} &amp; \dots &amp; x_{(n-1)3} &amp; x_{(n-1)n}\\
y_n &amp; x_{n1} &amp; x_{n2} &amp; x_{n3} &amp; \dots &amp; x_{(n-1)(n-1)} &amp; x_{nn}
\end{array} \]
\end{document}
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