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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}
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