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+%%
+%% An UIT Edition example
+%%
+%% Example 09-03-1 on page 168.
+%%
+%% 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}{0}
+\renewcommand\theequation{9.\arabic{equation}}
+\StartShownPreambleCommands
+\usepackage{amsmath,amscd}
+\StopShownPreambleCommands
+\begin{document}
+\begin{align}
+\begin{CD}
+ R\times S\times T @>\text{restriction}>> S\times T \\
+ @V\text{proj}VV @VV\text{proj}V \\
+ R\times S @<<\text{inclusion}< S
+\end{CD}
+\end{align}
+\end{document}