%% 
%%  The LaTeX Graphics Companion, 2ed (first printing May 2007)
%% 
%%  Example 7-4-7 on page 483.
%% 
%%  Copyright (C) 2007 Michel Goossens, Frank Mittelbach, Denis Roegel, Sebastian Rahtz, Herbert Vo\ss 
%% 
%%  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{207.83385pt}
\StartShownPreambleCommands
\usepackage{diagxy,amsmath}
\DeclareMathOperator\Hom{Hom}
\DeclareMathOperator\Sub{Sub}
\StopShownPreambleCommands
\begin{document}
\[\bfig
 \Square/^{ (}->`>`>`^{ (}->/<350>%
     [\Hom(X,2^Y)`\Sub(X\times Y)`
      \Hom(X',2^{Y'})`\Sub(X'\times Y');
      \alpha(X,Y)```\alpha(X',Y')]
\efig\]
\end{document}
