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+%%
+%% An UIT Edition example
+%%
+%% Example 06-03-22 on page 97.
+%%
+%% 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{201.70511pt}
+\AtBeginDocument{\setlength\parindent{0pt}
+\setcounter{equation}{46}
+\renewcommand\theequation{6.\arabic{equation}}}
+\usepackage{amsmath}
+\makeatletter
+\def\env@matrix{\hskip -\arraycolsep
+ \let\@ifnextchar\new@ifnextchar
+ \array{*\c@MaxMatrixCols r}}% r for right
+\renewenvironment{smallmatrix}{\null\,\vcenter\bgroup
+ \Let@\restore@math@cr\default@tag
+ \baselineskip6\ex@ \lineskip1.5\ex@ \lineskiplimit\lineskip
+ \ialign\bgroup\hfil$\m@th\scriptstyle##$%
+ &&\thickspace\hfil
+ $\m@th\scriptstyle##$%
+ \crcr
+}{\crcr\egroup\egroup\,}
+\makeatother
+\StartShownPreambleCommands
+\usepackage{amsmath}
+\StopShownPreambleCommands
+\begin{document}
+\begin{align}
+\begin{pmatrix}
+ 1 &-2 & 1 & 2\\ 2 & 3 &-2 & 3\\
+ 4 &-1 & 3 &-1\\ 3 & 2 &-4 & 5
+\end{pmatrix}
+\end{align}
+\begin{align}
+\left(\begin{smallmatrix}
+ 1 &-2 & 1 & 2\\ +2 & 3 &-2 & 3\\
+ 4 &-1 & 3 &-1\\ +3 & 2 &-4 & 5
+\end{smallmatrix}\right)
+\end{align}
+\end{document}