%% This is file `amscd.sty' generated from `amscd.doc'
%% on 21-JUN-1991 by the docstrip.ams utility (1.0). 
%% 
%%@texfile{
%% filename="amscd.sty",
%% version="1.1",
%% date="21-JUN-1991",
%% filetype="AMS-LaTeX: option",
%% copyright="Copyright (C) American Mathematical Society, all rights
%%   reserved.  Copying of this file is authorized only if either:
%%   (1) you make absolutely no changes to your copy, including name;
%%   OR (2) if you do make changes, you first rename it to some other
%%   name.",
%% author="American Mathematical Society",
%% address="American Mathematical Society,
%%   Technical Support Department,
%%   P. O. Box 6248,
%%   Providence, RI 02940,
%%   USA",
%% telephone="401-455-4080 or (in the USA) 800-321-4AMS",
%% email="Internet: Tech-Support@Math.AMS.org",
%% checksumtype="line count",
%% checksum="180",
%% codetable="ISO/ASCII",
%% keywords="latex, amslatex, ams-latex, commutative diagram",
%% abstract="This file is part of the AMS-\LaTeX{} package, ver. 1.1.
%%   It is a \LaTeX{} option that adapts the commutative diagram macros
%%   of AMS-\TeX{} for use in \LaTeX{}."
%%}
\expandafter\ifx\csname amscd.sty\endcsname\relax
\expandafter\def\csname amscd.sty\endcsname{}
\else\message{---already loaded}\endinput\fi
\def\filename{amscd.sty}
\def\fileversion{1.1} \def\filedate{21-JUN-1991}
\immediate\write16{%
AMS-Latex option `\filename' (\fileversion, \filedate)}
%%% end of file header
\def\Invalid@@{Invalid use of \string}
\def\Let@{\let\\\math@cr}
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\@ifundefined{math@cr}
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          {\global\@eqpen\interdisplaylinepenalty \math@cr@}}}
  {}
\def\math@cr@{\new@ifnextchar[\math@cr@@{\math@cr@@[\z@]}}
\def\math@cr@@[#1]{\ifnum0=`{\fi}\math@cr@@@
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\def\restore@math@cr{\def\math@cr@@@{\cr}}
\restore@math@cr
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\def\new@ifnch{\ifx\@tempc \@tempe \let\@tempd\@tempa
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\def\new@ifstar#1#2{\new@ifnextchar *{\def\@tempa*{#1}\@tempa}{#2}}
\def\DN@{\def\next@}
\def\FN@{\futurelet\next}
\def\setboxz@h{\setbox\z@\hbox}
\def\wdz@{\wd\z@}
\def\setbox@ne{\setbox\@ne}
\def\wd@ne{\wd\@ne}
\def\rightarrowfill@#1{\m@th\setboxz@h{$#1-$}\ht\z@\z@
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\def\leftarrowfill@#1{\m@th\setboxz@h{$#1-$}\ht\z@\z@
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\def\leftrightarrowfill@#1{\m@th\setboxz@h{$#1-$}\ht\z@\z@
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\long\def\@rightmark#1#2{#2}
\long\def\@ifempty#1{%
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\long\def\@ifnotempty#1{\@ifempty{#1}{}}
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\begingroup \catcode`\@=\active
\xdef @{\expandafter\noexpand\csname FN\string @\endcsname
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\endgroup
\def\at@{\let\next@\at@@
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 \ifcat\noexpand\next\relax\else
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\def\at@@#1{\expandafter
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\def\at@@@{\err@{\Invalid@@ @}{\the\athelp@}\char64\relax}
\@ifundefined{athelp@}{\csname newhelp\endcsname\athelp@
{Only certain combinations beginning with @ make sense to me.^^J%
I'll assume you wanted @@ for a printed @.}}{}
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\@ifundefined{default@tag}%
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\@ifundefined{bigaw@}{\newdimen\bigaw@}{}
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\newdimen\minCDarrowwidth
\minCDarrowwidth2.5pc
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\let\ampersand@\relax
\def\CD{\catcode`\@\active
 \bgroup\relax\iffalse{\fi\let\ampersand@&\iffalse}\fi
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 \tabskip\z@skip\baselineskip20\ex@
 \lineskip3\ex@\lineskiplimit3\ex@\halign\bgroup
 &\hfill$\m@th##$\hfill\crcr}
\def\endCD{\crcr\egroup\egroup\egroup}
\def\CD@check#1#2{\ifCD@\DN@{#2}\else
  \DN@{\err@{@\string#1 not
    allowed outside of the CD environment}\@eha}%
  \fi\next@}
\atdef@>#1>#2>{\ampersand@
  \ifCD@ \global\bigaw@\minCDarrowwidth \else \global\bigaw@\minaw@ \fi
  \setboxz@h{$\m@th\scriptstyle\;{#1}\;\;$}%
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  \@ifnotempty{#2}{\setbox@ne\hbox{$\m@th\scriptstyle\;{#2}\;\;$}%
    \ifdim\wd@ne>\bigaw@\global\bigaw@\wd@ne\fi}%
 \ifCD@\enskip\fi
   \mathrel{\mathop{\hbox to\bigaw@{\rightarrowfill@\displaystyle}}%
     \limits^{#1}\@ifnotempty{#2}{_{#2}}}%
 \ifCD@\enskip\fi \ampersand@}
\atdef@<#1<#2<{\ampersand@
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  \setboxz@h{$\m@th\scriptstyle\;\;{#1}\;$}%
  \ifdim\wdz@>\bigaw@ \global\bigaw@\wdz@ \fi
  \@ifnotempty{#2}{\setbox@ne\hbox{$\m@th\scriptstyle\;\;{#2}\;$}%
    \ifdim\wd@ne>\bigaw@ \global\bigaw@\wd@ne \fi}%
  \ifCD@\enskip\fi
    \mathrel{\mathop{\hbox to\bigaw@{\leftarrowfill@\displaystyle}}%
      \limits^{#1}\@ifnotempty{#2}{_{#2}}}%
  \ifCD@\enskip\fi \ampersand@}
\begingroup \catcode`\~=\active \lccode`\~=`\@
\lowercase{%
  \global\atdef@)#1)#2){~>#1>#2>}
  \global\atdef@(#1(#2({~<#1<#2<}
}% end lowercase
\endgroup
\atdef@ A#1A#2A{\CD@check{A..A..A}{\llap{$\m@th\vcenter{\hbox
  {$\scriptstyle#1$}}$}\Big\uparrow
  \rlap{$\m@th\vcenter{\hbox{$\scriptstyle#2$}}$}&&}}
\atdef@ V#1V#2V{\CD@check{V..V..V}{\llap{$\m@th\vcenter{\hbox
  {$\scriptstyle#1$}}$}\Big\downarrow
  \rlap{$\m@th\vcenter{\hbox{$\scriptstyle#2$}}$}&&}}
\atdef@={\CD@check={&\enskip\mathrel
  {\vbox{\hrule\@width\minCDarrowwidth\vskip2\ex@\hrule\@width
  \minCDarrowwidth}}\enskip&}}
\atdef@|{\CD@check|{\Big\Vert&&}}
\atdef@\vert{\CD@check\vert{\Big\Vert&&}}
\atdef@.{\CD@check.{&&}}
%% \CharacterTable
%%  {Upper-case    \A\B\C\D\E\F\G\H\I\J\K\L\M\N\O\P\Q\R\S\T\U\V\W\X\Y\Z
%%   Lower-case    \a\b\c\d\e\f\g\h\i\j\k\l\m\n\o\p\q\r\s\t\u\v\w\x\y\z
%%   Digits        \0\1\2\3\4\5\6\7\8\9
%%   Exclamation   \!     Double quote  \"     Hash (number) \#
%%   Dollar        \$     Percent       \%     Ampersand     \&
%%   Acute accent  \'     Left paren    \(     Right paren   \)
%%   Asterisk      \*     Plus          \+     Comma         \,
%%   Minus         \-     Point         \.     Solidus       \/
%%   Colon         \:     Semicolon     \;     Less than     \<
%%   Equals        \=     Greater than  \>     Question mark \?
%%   Commercial at \@     Left bracket  \[     Backslash     \\
%%   Right bracket \]     Circumflex    \^     Underscore    \_
%%   Grave accent  \`     Left brace    \{     Vertical bar  \|
%%   Right brace   \}     Tilde         \~}
\endinput
%% 
%% End of file `amscd.sty'.