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%%
%% The LaTeX Graphics Companion, 2ed (first printing May 2007)
%%
%% Example 7-4-2 on page 479.
%%
%% 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{159.83385pt}
\StartShownPreambleCommands
\usepackage[curve,arrow,frame]{xy}
\StopShownPreambleCommands
\begin{document}
\[\begin{xy} <1cm,0cm>:
(0,0)*+@{*}="a"*+!DL{\mathrm{A}},"a"
\ar@(dr,dl)
\ar@{~>} (2,0)*+@{*}="b"*+!DR{\mathrm{B}},"b"
\ar@(r,d) "b";"b"
\ar@{<->} "b";(2,2)*+@{*}="c"*+!UR{\mathrm{C}},"c"
\ar@(u,r) "c";"c" |*=<2pt>[o][F]{}
\ar@(ul,dr) "c"; (0,2)*+@{*}="d"*+!U{\mathrm{D}},"d"
\ar@(ul,ur) "d";"d"
\ar@{.>}@`{(-0.8,1.5),(0.,1.0),(-0.8,0.5)} "d";
\end{xy}\]
\end{document}
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