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+%%
+%% The LaTeX Companion, 2ed (second printing August 2004)
+%%
+%% Example 8-3-6 on page 488.
+%%
+%% Copyright (C) 2004 Frank Mittelbach, Michel Goossens,
+%%    Johannes Braams, David Carlisle, and Chris Rowley
+%%
+%% 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.
+%%
+
+\documentclass{ttctexa}
+\pagestyle{empty}
+\setcounter{page}{6}
+\setlength\textwidth{207.0pt}
+
+\StartShownPreambleCommands
+\usepackage{amsmath,amscd}
+\DeclareMathOperator\add{add}
+\DeclareMathOperator\cf {cf}
+\DeclareMathOperator\cov{cov}
+\DeclareMathOperator\non{non}
+\StopShownPreambleCommands
+\begin{document}
+\[ \begin{CD}
+     \cov (L) @>>> \non (K) @>>> \cf (K)  \\
+       @VVV          @AAA          @AAA   \\
+     \add (L) @>>> \add (K) @>>> \cov (K) \\
+   \end{CD} \]
+\end{document}