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+%%
+%% An UIT Edition example
+%%
+%% Example 09-03-2 on page 169.
+%%
+%% 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}{1}
+\renewcommand\theequation{9.\arabic{equation}}
+\StartShownPreambleCommands
+\usepackage{amsmath,amscd}
+\newcommand\cov{\operatorname{cov}}\newcommand\non{\operatorname{non}}
+\newcommand\cf{\operatorname{cf}} \newcommand\add{\operatorname{add}}
+\StopShownPreambleCommands
+\begin{document}
+\begin{equation}
+\begin{CD}
+ \cov(\mathcal{L}) @>>> \non(\mathcal{K}) @>>> \cf(\mathcal{K}) @>>>
+ \cf(\mathcal{L})\\
+ @VVV @AAA @AAA @VVV\\
+ \add(\mathcal{L}) @>>> \add(\mathcal{K}) @>>> \cov(\mathcal{K}) @>>>
+ \non(\mathcal{L})
+\end{CD}
+\end{equation}
+\end{document}