<html><head><meta name="color-scheme" content="light dark"></head><body><pre style="word-wrap: break-word; white-space: pre-wrap;">%% 
%%  An UIT Edition example
%% 
%%  Example 09-19-2 on page 195.
%% 
%%  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{177.70511pt}
\AtBeginDocument{\setlength\parindent{0pt}}
\StartShownPreambleCommands
\usepackage[all,line]{xy} \usepackage{graphicx}
\StopShownPreambleCommands
\begin{document}
\CompileMatrices
\xymatrix{
 &amp; 0 \ar[rr] &amp; &amp; A^p \ar@{^{(}-&gt;}[rr]^{f^p} \ar[ld]_{d_A^p}
   \ar'[d][dd]^{\alpha^p} &amp; &amp; B^p \ar@{&gt;&gt;}[rr]^{g^p} \ar[ld]_{d_B^p}
   \ar@/^/@{.&gt;}[ld] \ar'[d][dd]^{\beta^p} &amp; &amp; C^p \ar[rr] \ar[ld]_{d_C^p}
   \ar@/^/@{.&gt;}[ll] \ar'[d][dd]^{\gamma^p} \ar@/_/@{.&gt;}[dd] &amp; &amp; 0 \\
0 \ar[rr] &amp; &amp; A^{p+1} \ar@{^{(}-&gt;}[rr]^(.7){f^{p+1}}
  \ar[dd]^(.3){\alpha^{p+1}} \ar@/_/@{.&gt;}[dd] &amp; &amp; B^{p+1}
  \ar@{&gt;&gt;}[rr]^(.7){g^{p+1}} \ar@/^/@{.&gt;}[ll]
  \ar[dd]^(.3){\beta^{p+1}} &amp; &amp; C^{p+1} \ar[rr]
  \ar[dd]^(.3){\gamma^{p+1}} &amp; &amp; 0 &amp; \\
 &amp; 0 \ar'[r][rr] &amp; &amp; A_1^p \ar[ld]_{d_{A_{1}}^p}
  \ar@{^{(}-&gt;}'[r]^{f_1^{p}}[rr] &amp; &amp; B_1^p
  \ar[ld]_{d_{B_1}^p} \ar@{&gt;&gt;}'[r]^{g_1^{p}}[rr]
  \ar@/^/@{.&gt;}[ld] &amp; &amp; C_1^p \ar[rr]
  \ar[ld]_{d_{C_1}^p} \ar@/^/@{.&gt;}[ll] &amp; &amp; 0 \\
0 \ar[rr] &amp; &amp; A_1^{p+1} \ar@{^{(}-&gt;}[rr]^{f_1^{p+1}} &amp; &amp; B_1^{p+1}
  \ar@{&gt;&gt;}[rr]^{g_1^{p+1}} \ar@/^/@{.&gt;}[ll] &amp; &amp; C_1^{p+1} \ar[rr] &amp; &amp;
 0 &amp; }
\end{document}
</pre></body></html>