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    Length: 49930 (0xc30a)
    Types: TextFile
    Names: »amstex.sty«

└─⟦52210d11f⟧ Bits:30007239 EUUGD2: TeX 3 1992-12
    └─⟦e01e283ed⟧ »amstex/amslatex.tar.Z« 
        └─⟦d6381fb14⟧ 
            └─⟦this⟧ »amslatex/inputs/amstex.sty« 

TextFile

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 
%% This file is part of the AMS-LaTeX Version 1.0 distribution       %% 
%%    American Mathematical Society, Technical Support Group,        %% 
%%    P. O. Box 6248, Providence, RI 02940                           %% 
%%    800-321-4AMS (321-4267) or 401-455-4080                        %% 
%%    Internet: Tech-Support@Math.AMS.com                            %% 
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 
%% This is file `AMSTEX.STY',
%% generated on August 29, 1990 from `amstex.doc'
%% using the stripb utility (v0.9---derived from docstrip.tex).
%% 
\def\fileversion{v1.0b}
\def\filedate{29-AUG-1990}
\def\docdate {3-JUL-1990}

%% \CheckSum{5673}
%% \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         \~}
%%
\@ifundefined{relaxnext@}{}{\endinput}
\immediate\write\sixt@@n{Style option: `amstex' \space\space
        \fileversion \space <\filedate>  (FMi, RmS; MJD)}
\immediate\write\sixt@@n{English documentation
    \@spaces\@spaces\space  <\docdate>  (FMi, RmS; MJD)}
\input{amstext.sty}          % AMS \text macro
\input{amsfonts.sty}         % AMS font specific stuff
\input{amsbsy.sty}           % AMS \boldsymbol
\def\FN@{\futurelet\next}
\def\DN@{\def\next@}
\def\RIfM@{\relax\protect\ifmmode}
\def\setboxz@h{\setbox\z@\hbox}
\def\wdz@{\wd\z@}
\def\boxz@{\box\z@}
\def\setbox@ne{\setbox\@ne}
\def\wd@ne{\wd\@ne}
\def\relaxnext@{\let\next\relax}
\def\iterate{\body\expandafter\iterate\else\fi}
\def\err@#1#2{\iffirstchoice@
  \edef\@tempc{#2}\errhelp\expandafter{\@tempc}%
  \typeout{^^JAmS-TeX error:}%
  \errmessage{#1}\fi}

\def\nomath@env{\err@{\string\begin{\@currenvir}
   allowed only in paragraph mode!}\@ehb}
\def\Invalid@@{Invalid use of \string}
\def\Invalid@#1{\def#1{\err@{\Invalid@@#1}\@eha}}
\newhelp\athelp@
{Only certain combinations beginning with @ make sense to me.^^J%
Perhaps you wanted @@ for a printed @? \space
I'll assume that you meant @@.}
\def\at@
 {\ifcat\noexpand\next a\let\next\at@@\else
 \ifcat\noexpand\next0\let\next\at@@\else
 \ifcat\noexpand\next\relax\let\next\at@@@\else
 \let\next\at@@@@\fi\fi\fi\next}

\def\atdef@#1{\expandafter\def\csname #1@at\endcsname}
\def\atdef@@#1{\expandafter\def\csname \string#1@@at\endcsname}
\begingroup
 \catcode`\@=11 \catcode`\~=\active
 \lccode`\~=`\@ %\lccode`\I=`\I
 \lowercase
  {\gdef~{\FN@\at@}
   \gdef\at@@#1{\expandafter
     \ifx\csname #1@at\endcsname\relax\def\next
       {\err@{\Invalid@@~}{\the\athelp@}@#1}\else
       \def\next{\csname #1@at\endcsname}\fi\next}%
   \gdef\at@@@#1{\expandafter
     \ifx\csname \string#1@@at\endcsname\relax\def\next
      {\err@{\Invalid@@~}{\the\athelp@}@#1}\else
       \def\next{\csname \string#1@@at\endcsname}\fi\next}%
   \gdef\at@@@@#1{\err@{\Invalid@@~}{\the\athelp@}}
   \global\atdef@@ ~{\char`\@\relax}} % to define @@
\endgroup

\def\makeatother{\catcode`\@\active}
{\def\@makeother{\noexpand\@makeother\noexpand}
\xdef\@sanitize{\@sanitize\@makeother\@}}
{\def\do{\noexpand\do\noexpand}
\xdef\dospecials{\dospecials\do\@}}
\atdef@,{\RIfM@\mskip.1\thinmuskip\protect\else
      \protect\nonmatherr@{@,}\protect\fi}
\atdef@!{\RIfM@\mskip-.1\thinmuskip\protect\else
      \protect\nonmatherr@{@!}\protect\fi}
\let\ic@\/
\def\/{\unskip\ic@}
\def~{\unskip\nobreak\ \ignorespaces}
\def\AmSTeX{{\protect\the\textfont\tw@
   A\kern-.1667em\lower.5ex\hbox{M}\kern-.125emS}%
  -T\kern-.1667em\lower.7ex\hbox{E}\kern-.125emX}
\def\nonmatherr@#1{\err@
  {\string#1\space allowed only in math mode}\@ehd}
\def\@lb{\RIfM@\lbrace\else$\m@th\lbrace$\fi}
\def\@rb{\RIfM@\rbrace\else$\m@th\rbrace$\fi}
\def\slash{\unskip/\penalty\exhyphenpenalty}
\def\pr@m@s{\ifx'\next\DN@##1{\prim@s}\else\let\next@\egroup\fi\next@}
\def\prime{{\null\prime@\null}}
\mathchardef\prime@="0230
\def\,{\RIfM@\mskip\thinmuskip\protect\else\kern.16667em\protect\fi}
\def\!{\RIfM@\mskip-\thinmuskip\protect\else\kern-.16667em\protect\fi}
\let\thinspace\,
\let\negthinspace\!
\def\medspace{\RIfM@\mskip\medmuskip
  \protect\else\kern.222222em\protect\fi}
\def\negmedspace{\RIfM@\mskip-\medmuskip
  \protect\else\kern-.222222em\protect\fi}
\def\;{\RIfM@\mskip\thickmuskip\protect\else\kern.27777em\protect\fi}
\let\thickspace\;
\def\negthickspace{\RIfM@\mskip-\thickmuskip\protect\else
 \kern-.27777em\protect\fi}
\def\And{\DOTSB\;\mathchar"3026 \;} %change%
\def\implies{\DOTSB\;\Longrightarrow\;}
\def\impliedby{\DOTSB\;\Longleftarrow\;}
\def\frac{\protect\pfrac}
\def\pfrac{\new@ifnextchar[\frac@{\frac@[\@empty]}}
\def\frac@[#1]#2#3{\relax\ifx\@empty#1{#2\over#3}\else
  {#2\above#1\relax#3}\fi}
\def\fracwithdelims#1#2{\new@ifnextchar[{\fracwithdelims@#1#2}%
  {\fracwithdelims@#1#2[\@empty]}}
\def\fracwithdelims@#1#2[#3]#4#5{\relax
  \ifx\@empty#3{#4\overwithdelims#1#2#5}\else
  {#4\abovewithdelims#1#2#3\relax#5}\fi}
\def\dfrac#1#2{{\displaystyle{#1\over#2}}}
\def\tfrac#1#2{{\textstyle{#1\over#2}}}
\def\binom#1#2{{#1\choose#2}}
\def\dbinom#1#2{{\displaystyle{#1\choose#2}}}
\def\tbinom#1#2{{\textstyle{#1\choose#2}}}
\def\colon{\nobreak\mskip2mu\mathpunct{}\nonscript
  \mkern-\thinmuskip{:}\mskip6muplus1mu\relax}
\let\slimits@\displaylimits
\mathchardef\coprod@="1360    \def\coprod{\DOTSB\coprod@\slimits@}
\mathchardef\bigvee@="1357    \def\bigvee{\DOTSB\bigvee@\slimits@}
\mathchardef\bigwedge@="1356  \def\bigwedge{\DOTSB\bigwedge@\slimits@}
\mathchardef\biguplus@="1355  \def\biguplus{\DOTSB\biguplus@\slimits@}
\mathchardef\bigcap@="1354    \def\bigcap{\DOTSB\bigcap@\slimits@}
\mathchardef\bigcup@="1353    \def\bigcup{\DOTSB\bigcup@\slimits@}
\mathchardef\prod@="1351      \def\prod{\DOTSB\prod@\slimits@}
\mathchardef\sum@="1350       \def\sum{\DOTSB\sum@\slimits@}
\mathchardef\bigotimes@="134E \def\bigotimes{\DOTSB\bigotimes@\slimits@}
\mathchardef\bigoplus@="134C  \def\bigoplus{\DOTSB\bigoplus@\slimits@}
\mathchardef\bigodot@="134A   \def\bigodot{\DOTSB\bigodot@\slimits@}
\mathchardef\bigsqcup@="1346  \def\bigsqcup{\DOTSB\bigsqcup@\slimits@}
\let\ilimits@\nolimits
\def\int{\DOTSI\intop\ilimits@}
\def\oint{\DOTSI\ointop\ilimits@}
\def\intic@{%
  \mathchoice{\hskip.5em}{\hskip.4em}{\hskip.4em}{\hskip.4em}}
\def\negintic@{\mathchoice
 {\hskip-.5em}{\hskip-.4em}{\hskip-.4em}{\hskip-.4em}}
\def\intkern@{\mathchoice{\!\!\!}{\!\!}{\!\!}{\!\!}}
\def\intdots@{\mathchoice{\@cdots}
 {{\cdotp}\mkern1.5mu{\cdotp}\mkern1.5mu{\cdotp}}
 {{\cdotp}\mkern1mu{\cdotp}\mkern1mu{\cdotp}}
 {{\cdotp}\mkern1mu{\cdotp}\mkern1mu{\cdotp}}}
\newcount\intno@
\def\iint{\DOTSI\intno@\tw@\FN@\ints@}
\def\iiint{\DOTSI\intno@\thr@@\FN@\ints@}
\def\iiiint{\DOTSI\intno@4 \FN@\ints@}
\def\idotsint{\DOTSI\intno@\z@\FN@\ints@}
\def\ints@{\findlimits@\ints@@}
\newif\iflimtoken@
\newif\iflimits@
\def\findlimits@{\limtoken@true\ifx\next\limits\limits@true
 \else\ifx\next\nolimits\limits@false\else
 \limtoken@false\ifx\ilimits@\nolimits\limits@false\else
 \ifinner\limits@false\else\limits@true\fi\fi\fi\fi}
\def\multint@{\int\ifnum\intno@=\z@\intdots@
 \else\intkern@\fi
 \ifnum\intno@>\tw@\int\intkern@\fi
 \ifnum\intno@>\thr@@\int\intkern@\fi
 \int}
\def\multintlimits@{\intop\ifnum\intno@=\z@\intdots@
  \else\intkern@\fi
 \ifnum\intno@>\tw@\intop\intkern@\fi
 \ifnum\intno@>\thr@@\intop\intkern@\fi\intop}
\def\ints@@{\iflimtoken@
 \def\ints@@@{%
   \iflimits@\negintic@\mathop{\intic@\multintlimits@}\limits
  \else\multint@\nolimits\fi
  \@gobble} %4
 \else
 \def\ints@@@{\iflimits@\negintic@
  \mathop{\intic@\multintlimits@}\limits\else
  \multint@\nolimits\fi}\fi\ints@@@}
\let\nlimits@\displaylimits
\def\nolimits@{\relaxnext@
 \DN@{\ifx\next\limits\DN@\limits{\nolimits}\else
  \let\next@\nolimits\fi\next@}%
 \FN@\next@}
\def\newmcodes@{\mathcode`\'39\mathcode`\*42\mathcode`\."613A%
 \mathcode`\-45\mathcode`\/47\mathcode`\:"603A\relax}
\def\operatorname#1{\mathop{\newmcodes@\kern\z@
 \operator@font#1}\nolimits@}
\def\operatornamewithlimits#1{\mathop{\newmcodes@\kern\z@
 \operator@font#1}\nlimits@}
\def\qopname@#1{\mathop{\operator@font#1}\nolimits@}
\def\qopnamewl@#1{\mathop{\operator@font#1}\nlimits@}
\def\arccos{\qopname@{arccos}}
\def\arcsin{\qopname@{arcsin}}
\def\arctan{\qopname@{arctan}}
\def\arg{\qopname@{arg}}
\def\cos{\qopname@{cos}}
\def\cosh{\qopname@{cosh}}
\def\cot{\qopname@{cot}}
\def\coth{\qopname@{coth}}
\def\csc{\qopname@{csc}}
\def\deg{\qopname@{deg}}
\def\det{\qopnamewl@{det}}
\def\dim{\qopname@{dim}}
\def\exp{\qopname@{exp}}
\def\gcd{\qopnamewl@{gcd}}
\def\hom{\qopname@{hom}}
\def\inf{\qopnamewl@{inf}}
\def\injlim{\qopnamewl@{inj\,lim}}
\def\ker{\qopname@{ker}}
\def\lg{\qopname@{lg}}
\def\lim{\qopnamewl@{lim}}
\def\liminf{\qopnamewl@{lim\,inf}}
\def\limsup{\qopnamewl@{lim\,sup}}
\def\ln{\qopname@{ln}}
\def\log{\qopname@{log}}
\def\max{\qopnamewl@{max}}
\def\min{\qopnamewl@{min}}
\def\Pr{\qopnamewl@{Pr}}
\def\projlim{\qopnamewl@{proj\,lim}}
\def\sec{\qopname@{sec}}
\def\sin{\qopname@{sin}}
\def\sinh{\qopname@{sinh}}
\def\sup{\qopnamewl@{sup}}
\def\tan{\qopname@{tan}}
\def\tanh{\qopname@{tanh}}
\def\varlim@#1#2{\mathop{\vtop{\ialign{##\crcr
 \hfil$#1\m@th\operator@font lim$\hfil\crcr
 \noalign{\nointerlineskip}#2#1\crcr
 \noalign{\nointerlineskip\kern-\ex@}\crcr}}}}
\def\varinjlim{\mathpalette\varlim@\rightarrowfill@}
\def\varprojlim{\mathpalette\varlim@\leftarrowfill@}
\def\varliminf{\mathpalette\varliminf@{}}
\def\varliminf@#1{\mathop{\underline{\vrule\@depth.2\ex@\@width\z@
   \hbox{$#1\m@th\operator@font lim$}}}}
\def\varlimsup{\mathpalette\varlimsup@{}}
\def\varlimsup@#1{\mathop{\overline
  {\hbox{$#1\m@th\operator@font lim$}}}}
\newtoks\hashtoks@
\hashtoks@{#}
\def\pmatrix{\left(\matrix}
\def\endpmatrix{\endmatrix\right)}
\def\bmatrix{\left[\matrix}
\def\endbmatrix{\endmatrix\right]}
\def\vmatrix{\left|\matrix}
\def\endvmatrix{\endmatrix\right|}
\def\Vmatrix{\left\|\matrix}
\def\endVmatrix{\endmatrix\right\|}
\let\hdots\@ldots
\def\hdotsfor#1{\if\noexpand#1[\expandafter\shdots@for\else
                \hdots@for\@ne{#1}\fi}

\def\shdots@for#1]{\hdots@for{#1}}
\def\hdots@for#1#2{\multicolumn{#2}c%
  {\m@th\mkern-#1\dotsspace@
   \xleaders\hbox{$\m@th\mkern#1\dotsspace@.\mkern#1\dotsspace@$}%
           \hfill
   \mkern-#1\dotsspace@}%
   }
\def\numberwithin#1#2{\@ifundefined{c@#1}{\@nocnterrr}{%
  \@ifundefined{c@#2}{\@nocnterr}{%
  \@addtoreset{#1}{#2}%
  \toks@\expandafter\expandafter\expandafter{\csname the#1\endcsname}%
  \expandafter\xdef\csname the#1\endcsname
    {\expandafter\noexpand\csname the#2\endcsname
     .\the\toks@}}}}
\newif\ifctagsplit@
\def\bmod{\mskip-\medmuskip\mkern5mu\mathbin
 {\operator@font mod}\penalty900
 \mkern5mu\mskip-\medmuskip}
\def\pmod#1{\allowbreak\ifinner\mkern8mu\else\mkern18mu\fi
 ({\operator@font mod}\,\,#1)}
\def\pod#1{\allowbreak\ifinner\mkern8mu\else\mkern18mu\fi(#1)}
\def\mod#1{\allowbreak\ifinner\mkern12mu
  \else\mkern18mu\fi{\operator@font mod}\,\,#1}
\def\cfrac#1#2{\dfrac{\strut#1}{#2}\kern-\nulldelimiterspace}
\def\lcfrac#1{\cfrac{#1\hfill}}
\def\rcfrac#1{\cfrac{\hfill#1}}
\def\overset#1#2{\binrel@{#2}%
 \binrel@@{\mathop{\kern\z@#2}\limits^{#1}}}
\def\underset#1#2{\binrel@{#2}%
 \binrel@@{\mathop{\kern\z@#2}\limits_{#1}}}
\def\sideset#1#2#3{%
 \setbox@ne\hbox{$\displaystyle{\vphantom{#3}}#1{#3}\m@th$}%
 \setbox\tw@\hbox{$\displaystyle{#3}#2\m@th$}%
 \hskip\wd@ne\hskip-\wd\tw@\mathop{\hskip\wd\tw@\hskip-\wd@ne
  {\vphantom{#3}}#1{#3}#2}}
\def\rightarrowfill@#1{$#1\m@th\mathord-\mkern-6mu\cleaders
\hbox{$#1\mkern-2mu\mathord-\mkern-2mu$}\hfill
\mkern-6mu\mathord\rightarrow$}

\def\leftarrowfill@#1{$#1\m@th\mathord\leftarrow\mkern-6mu\cleaders
 \hbox{$#1\mkern-2mu\mathord-\mkern-2mu$}\hfill\mkern-6mu\mathord-$}

\def\leftrightarrowfill@#1{$#1\m@th\mathord\leftarrow\mkern-6mu\cleaders
 \hbox{$#1\mkern-2mu\mathord-\mkern-2mu$}\hfill
 \mkern-6mu\mathord\rightarrow$}

\def\overarrow@#1#2#3{\vbox{\ialign{##\crcr#1#2\crcr
 \noalign{\kern-\ex@\nointerlineskip}$\m@th\hfil#2#3\hfil$\crcr}}}
\def\overrightarrow{\mathpalette{\overarrow@\rightarrowfill@}}
\def\overleftarrow{\mathpalette{\overarrow@\leftarrowfill@}}
\def\overleftrightarrow{\mathpalette{\overarrow@\leftrightarrowfill@}}

\def\underarrow@#1#2#3{%
 \vtop{\ialign{##\crcr$\m@th\hfil#2#3\hfil$\crcr
 \noalign{\nointerlineskip\kern-.5\ex@}#1#2\crcr}}}
\def\underrightarrow{\mathpalette{\underarrow@\rightarrowfill@}}
\def\underleftarrow{\mathpalette{\underarrow@\leftarrowfill@}}
\def\underleftrightarrow{\mathpalette{\underarrow@\leftrightarrowfill@}}
\atdef@>#1>#2>{\setboxz@h{$\m@th\scriptstyle\;{#1}\;\;$}%
 \setbox@ne\hbox{$\m@th\scriptstyle\;{#2}\;\;$}%
 \setbox\tw@\hbox{$\m@th#2$}%
 \global\bigaw@\minaw@
 \ifdim\wdz@>\bigaw@\global\bigaw@\wdz@\fi
 \ifdim\wd@ne>\bigaw@\global\bigaw@\wd@ne\fi
 \ifdim\wd\tw@>\z@
  \mathrel{\mathop{\hbox to\bigaw@{\rightarrowfill}}\limits^{#1}_{#2}}%
 \else\mathrel{\mathop{\hbox to\bigaw@{\rightarrowfill}}\limits^{#1}}\fi
}

\atdef@<#1<#2<{\setboxz@h{$\m@th\scriptstyle\;\;{#1}\;$}%
 \setbox@ne\hbox{$\m@th\scriptstyle\;\;{#2}\;$}%
 \setbox\tw@\hbox{$\m@th#2$}%
 \global\bigaw@\minaw@
 \ifdim\wdz@>\bigaw@\global\bigaw@\wdz@\fi
 \ifdim\wd@ne>\bigaw@\global\bigaw@\wd@ne\fi
 \ifdim\wd\tw@>\z@
  \mathrel{\mathop{\hbox to\bigaw@{\leftarrowfill}}%
  \limits^{#1}_{#2}}\else
  \mathrel{\mathop{\hbox to\bigaw@{\leftarrowfill}}\limits^{#1}}\fi
}

\begingroup
 \catcode`\~=\active \lccode`\~=`\@
 \lowercase{%
  \global\atdef@)#1)#2){~>#1>#2>}
  \global\atdef@(#1(#2({~<#1<#2<}}
\endgroup

\newdimen\minaw@
\minaw@11.11128\ex@
\newdimen\bigaw@
\let\ifgbl@result\iffalse                              % initial value
\def\gbl@resulttrue{\global\let\ifgbl@result\iftrue}
\def\gbl@resultfalse{\global\let\ifgbl@result\iffalse}
\let\DOTSI\relax
\let\DOTSB\relax
\let\DOTSX\relax
{\uccode`7=`\\ \uccode`8=`m \uccode`9=`a \uccode`0=`t \uccode`!=`h
 \uppercase{%
  \gdef\math@#1#2#3#4#5#6\math@{\gbl@resultfalse\ifx 7#1\ifx 8#2%
  \ifx 9#3\ifx 0#4\ifx !#5\xdef\meaning@{#6}\gbl@resulttrue
  \fi\fi\fi\fi\fi}}}
{\uccode`7=`c \uccode`8=`h \uccode`9=`\"
 \uppercase{\gdef\mathch@#1#2#3#4#5#6\mathch@{\gbl@resultfalse
  \ifx 7#1\ifx 8#2\ifx 9#5\gbl@resulttrue\xdef\meaning@{9#6}\fi\fi\fi}}}
\newcount\classnum@
\def\getmathch@#1.#2\getmathch@{\classnum@#1 \divide\classnum@4096
 \ifcase\number\classnum@\or\or\gdef\thedots@{\dotsb@}\or
 \gdef\thedots@{\dotsb@}\fi}
\newif\ifmathbin@
{\uccode`4=`b \uccode`5=`i \uccode`6=`n
 \uppercase{\gdef\mathbin@#1#2#3{\relaxnext@
  \def\nextii@##1\mathbin@{\ifx\@sptoken\next\global\mathbin@true\fi}%
 \global\mathbin@false\DN@##1\mathbin@{}%
 \ifx 4#1\ifx 5#2\ifx 6#3\DN@{\FN@\nextii@}\fi\fi\fi\next@}}}
\newif\ifmathrel@
{\uccode`4=`r \uccode`5=`e \uccode`6=`l
 \uppercase{\gdef\mathrel@#1#2#3{\relaxnext@
  \def\nextii@##1\mathrel@{\ifx\@sptoken\next\global\mathrel@true\fi}%
 \global\mathrel@false\DN@##1\mathrel@{}%
 \ifx 4#1\ifx 5#2\ifx 6#3\DN@{\FN@\nextii@}\fi\fi\fi\next@}}}
\newif\ifmacro@
{\uccode`5=`m \uccode`6=`a \uccode`7=`c
 \uppercase{\gdef\macro@#1#2#3#4\macro@{\global\macro@false
  \ifx 5#1\ifx 6#2\ifx 7#3\global\macro@true
  \xdef\meaning@{\macro@@#4\macro@@}\fi\fi\fi}}}
\def\macro@@#1->#2\macro@@{#2}
\newif\ifDOTS@
\newcount\DOTSCASE@
{\uccode`6=`\\ \uccode`7=`D \uccode`8=`O \uccode`9=`T \uccode`0=`S
 \uppercase{\gdef\DOTS@#1#2#3#4#5{\global\DOTS@false\DN@##1\DOTS@{}%
  \ifx 6#1\ifx 7#2\ifx 8#3\ifx 9#4\ifx 0#5\let\next@\DOTS@@
  \fi\fi\fi\fi\fi
  \next@}}}
{\uccode`3=`B \uccode`4=`I \uccode`5=`X
 \uppercase{\gdef\DOTS@@#1{\relaxnext@
  \def\nextii@##1\DOTS@{\ifx\@sptoken\next\global\DOTS@true\fi}%
  \DN@{\FN@\nextii@}%
  \ifx 3#1\global\DOTSCASE@\z@\else
  \ifx 4#1\global\DOTSCASE@\@ne\else
  \ifx 5#1\global\DOTSCASE@\tw@\else\DN@##1\DOTS@{}%
  \fi\fi\fi\next@}}}
\newif\ifnot@
{\uccode`5=`\\ \uccode`6=`n \uccode`7=`o \uccode`8=`t
 \uppercase{\gdef\not@#1#2#3#4{\relaxnext@
  \def\nextii@##1\not@{\ifx\@sptoken\next\global\not@true\fi}%
 \global\not@false\DN@##1\not@{}%
 \ifx 5#1\ifx 6#2\ifx 7#3\ifx 8#4\DN@{\FN@\nextii@}\fi\fi\fi
 \fi\next@}}}
\newif\ifkeybin@
\def\keybin@{\keybin@true
 \ifx\next+\else\ifx\next=\else\ifx\next<\else\ifx\next>\else
 \ifx\next-\else
 \ifx\next*\else\ifx\next:\else\keybin@false\fi\fi\fi\fi\fi\fi\fi}
\def\dots{\protect\pdots}
\def\pdots{\RIfM@\expandafter\mdots@\else\expandafter\tdots@\fi}
\def\tdots@{\unskip\relaxnext@
 \DN@{$\m@th\@ldots\,
   \ifx\next,\,$\else\ifx\next.\,$\else\ifx\next;\,$\else
   \ifx\next:\,$\else
   \ifx\next?\,$\else\ifx\next!\,$\else$ \fi\fi\fi\fi\fi\fi}%
 \ \FN@\next@}
\def\mdots@{\FN@\mdots@@}
\def\mdots@@{\gdef\thedots@{\dotso@}%
 \ifx\next\boldsymbol\gdef\thedots@\boldsymbol{\boldsymboldots@}\else
 \ifx,\next\gdef\thedots@{\dotsc}%
 \else\ifx\not\next\gdef\thedots@{\dotsb@}%
 \else\keybin@
 \ifkeybin@\gdef\thedots@{\dotsb@}%
 \else\xdef\meaning@{\meaning\next..........}\xdef\meaning@@{\meaning@}%
  \expandafter\math@\meaning@\math@
  \ifgbl@result
   \expandafter\mathch@\meaning@\mathch@
   \ifgbl@result\expandafter\getmathch@\meaning@\getmathch@\fi
  \else\expandafter\macro@\meaning@@\macro@
  \ifmacro@
   \expandafter\not@\meaning@\not@\ifnot@\gdef\thedots@{\dotsb@}%
  \else\expandafter\DOTS@\meaning@\DOTS@
  \ifDOTS@
   \ifcase\number\DOTSCASE@\gdef\thedots@{\dotsb@}%
    \or\gdef\thedots@{\dotsi}\else\fi
  \else\expandafter\math@\meaning@\math@
  \ifgbl@result\expandafter\mathbin@\meaning@\mathbin@
  \ifmathbin@\gdef\thedots@{\dotsb@}%
  \else\expandafter\mathrel@\meaning@\mathrel@
  \ifmathrel@\gdef\thedots@{\dotsb@}%
  \fi\fi\fi\fi\fi\fi\fi\fi\fi\fi\fi
 \thedots@}
\def\@cdots{\mathinner{\cdotp\cdotp\cdotp}}
\def\dotsi{\!\@cdots}
\let\dotsb@\@cdots
\newif\ifextra@
\newif\ifrightdelim@
\def\rightdelim@{\global\rightdelim@true
 \ifx\next)\else
 \ifx\next]\else
 \ifx\next\rbrack\else
 \ifx\next\}\else
 \ifx\next\rbrace\else
 \ifx\next\rangle\else
 \ifx\next\rceil\else
 \ifx\next\rfloor\else
 \ifx\next\rgroup\else
 \ifx\next\rmoustache\else
 \ifx\next\right\else
 \ifx\next\bigr\else
 \ifx\next\biggr\else
 \ifx\next\Bigr\else
 \ifx\next\Biggr\else\global\rightdelim@false
 \fi\fi\fi\fi\fi\fi\fi\fi\fi\fi\fi\fi\fi\fi\fi}
\def\extra@{%
 \global\extra@false\rightdelim@\ifrightdelim@\global\extra@true
 \else\ifx\next$\global\extra@true
 \else\xdef\meaning@{\meaning\next..........}%
 \expandafter\macro@\meaning@\macro@\ifmacro@
 \expandafter\DOTS@\meaning@\DOTS@
 \ifDOTS@
 \ifnum\DOTSCASE@=\tw@\global\extra@true
 \fi\fi\fi\fi\fi}
\newif\ifbold@
\def\dotso@{\relaxnext@
 \ifbold@
  \let\next\delayed@
  \def\nextii@{\extra@\@ldots\ifextra@\,\fi}%
 \else
  \def\nextii@{\DN@{\extra@\@ldots\ifextra@\,\fi}\FN@\next@}%
 \fi
 \nextii@}
\def\extrap@#1{%
 \DN@{#1\,}%
 \ifx\next,\else
 \ifx\next;\else
 \ifx\next.\else\extra@
 \ifextra@\else
 \let\next@#1\fi\fi\fi\fi\next@}
\def\pldots{\DN@{\extrap@\@ldots}\FN@\next@}
\def\cdots{\protect\pcdots}
\def\pcdots{\DN@{\extrap@\@cdots}\FN@\next@}
\let\dotso\ldots
\let\dotsb\cdots
\let\dotsm\dotsb
\def\dotsc{\protect\pdotsc}
\def\pdotsc{\relaxnext@
 \DN@{\ifx\next;\@ldots\,\else
  \ifx\next.\@ldots\,\else\extra@\@ldots
  \ifextra@\,\fi\fi\fi}%
 \FN@\next@}
\def\cdot{\mathchar"2201 }
\def\longrightarrow{\DOTSB\relbar\joinrel\rightarrow}
\def\Longrightarrow{\DOTSB\Relbar\joinrel\Rightarrow}
\def\longleftarrow{\DOTSB\leftarrow\joinrel\relbar}
\def\Longleftarrow{\DOTSB\Leftarrow\joinrel\Relbar}
\def\longleftrightarrow{\DOTSB\leftarrow\joinrel\rightarrow}
\def\Longleftrightarrow{\DOTSB\Leftarrow\joinrel\Rightarrow}
\def\mapsto{\DOTSB\mapstochar\rightarrow}
\def\longmapsto{\DOTSB\mapstochar\longrightarrow}
\def\hookrightarrow{\DOTSB\lhook\joinrel\rightarrow}
\def\hookleftarrow{\DOTSB\leftarrow\joinrel\rhook}
\def\doteq{\DOTSB\buildrel\textstyle.\over=}
\def\iff{\DOTSB\;\Longleftrightarrow\;}
\def\dddot#1{{\mathop{#1}\limits^{\vbox to-1.4\ex@{\kern-\tw@\ex@
 \hbox{\rm...}\vss}}}}
\def\ddddot#1{{\mathop{#1}\limits^{\vbox to-1.4\ex@{\kern-\tw@\ex@
 \hbox{\rm....}\vss}}}}
\def\sphat{^{\mathchoice{}{}%
 {\,\,\smash[b]{\hbox{\lower4\ex@\hbox{$\m@th\widehat{\null}$}}}}%
 {\,\smash[b]{\hbox{\lower3\ex@\hbox{$\m@th\hat{\null}$}}}}}}
\def\spcheck{^\vee}
\def\sptilde{^\sim}
\def\spdot{^{\hbox{\raise\ex@\hbox{\rm.}}}}
\def\spddot{^{\hbox{\raise\ex@\hbox{\rm..}}}}
\def\spdddot{^{\hbox{\raise\ex@\hbox{\rm...}}}}
\def\spbreve{^{\!\smash[b]{\hbox{\lower4\ex@\hbox{\u{}}}}}}

\def\oldnos#1{\RIfM@{\mathcode`\,"013B \mathgroup\@ne#1}\else
 \leavevmode\hbox{$\m@th\mathcode`\,"013B \mathgroup\@ne#1$}\fi}
\mathchardef\Gamma="0000
\mathchardef\Delta="0001
\mathchardef\Theta="0002
\mathchardef\Lambda="0003
\mathchardef\Xi="0004
\mathchardef\Pi="0005
\mathchardef\Sigma="0006
\mathchardef\Upsilon="0007
\mathchardef\Phi="0008
\mathchardef\Psi="0009
\mathchardef\Omega="000A
\mathchardef\varGamma="0100
\mathchardef\varDelta="0101
\mathchardef\varTheta="0102
\mathchardef\varLambda="0103
\mathchardef\varXi="0104
\mathchardef\varPi="0105
\mathchardef\varSigma="0106
\mathchardef\varUpsilon="0107
\mathchardef\varPhi="0108
\mathchardef\varPsi="0109
\mathchardef\varOmega="010A
\def\accentclass@{7}
\def\noaccents@{\def\accentclass@{0}}
\def\makeacc@#1#2{\def#1{\mathaccent"\accentclass@#2 }}
\makeacc@\hat{05E}
\makeacc@\check{014}
\makeacc@\tilde{07E}
\makeacc@\acute{013}
\makeacc@\grave{012}
\makeacc@\dot{05F}
\makeacc@\ddot{07F}
\makeacc@\breve{015}
\makeacc@\bar{016}
\def\vec{\mathaccent"017E }
\newcount\skewcharcount@
\newcount\familycount@
\def\theskewchar@{\familycount@\@ne
 \global\skewcharcount@\the\skewchar\textfont\@ne
 \ifnum\mathgroup>\m@ne\ifnum\mathgroup<16
  \global\familycount@\the\mathgroup\relax
  \global\skewcharcount@\the\skewchar\textfont\the\mathgroup\relax\fi\fi
 \ifnum\skewcharcount@>\m@ne
  \ifnum\skewcharcount@<128
  \multiply\familycount@256
  \global\advance\skewcharcount@\familycount@
  \global\advance\skewcharcount@28672
  \mathchar\skewcharcount@\else
  \global\skewcharcount@\m@ne\fi\else
 \global\skewcharcount@\m@ne\fi}
\newcount\pointcount@
\def\getpoints@#1.#2\getpoints@{\pointcount@#1 }
\newdimen\accentdimen@
\newcount\accentmu@
\def\dimentomu@{\multiply\accentdimen@ 100
 \expandafter\getpoints@\the\accentdimen@\getpoints@
 \multiply\pointcount@18
 \divide\pointcount@\@m
 \global\accentmu@\pointcount@}
\def\Makeacc@#1#2{\def#1{\RIfM@\DN@{\mathaccent@
 {"\accentclass@#2 }}\else\DN@{\nonmatherr@{#1}}\fi\next@}}

\def\mathaccent@#1#2{\ifnum\mathgroup=\m@ne\xdef\thefam@{1}\else
 \xdef\thefam@{\the\mathgroup}\fi
 \accentdimen@\z@
 \setboxz@h{\unbracefonts@$\m@th\mathgroup\thefam@\relax#2$}%
 \ifdim\accentdimen@=\z@\DN@{\mathaccent#1{#2}}%
  \setbox@ne\hbox{\unbracefonts@
    $\m@th\mathgroup\thefam@\relax#2\theskewchar@$}
  \setbox\tw@\hbox{$\m@th\ifnum\skewcharcount@=\m@ne\else
   \mathchar\skewcharcount@\fi$}%
  \global\accentdimen@\wd@ne\global\advance\accentdimen@-\wdz@
  \global\advance\accentdimen@-\wd\tw@
  \global\multiply\accentdimen@\tw@
  \dimentomu@\global\advance\accentmu@\@ne
 \else\DN@{{\mathaccent#1{#2\mkern\accentmu@ mu}%
    \mkern-\accentmu@ mu}{}}\fi
 \next@}\Makeacc@\Hat{05E}
\Makeacc@\Check{014}
\Makeacc@\Tilde{07E}
\Makeacc@\Acute{013}
\Makeacc@\Grave{012}
\Makeacc@\Dot{05F}
\Makeacc@\Ddot{07F}
\Makeacc@\Breve{015}
\Makeacc@\Bar{016}
\def\Vec{\RIfM@\DN@{\mathaccent@{"017E }}\else
 \DN@{\nonmatherr@\Vec}\fi\next@}
\def\accentedsymbol#1#2{\expandafter\newbox\csname\expandafter
  \@gobble\string#1@box\endcsname
 \expandafter\setbox\csname\expandafter\@gobble
  \string#1@box\endcsname\hbox{$\m@th#2$}\define
  #1{\expandafter\copy\csname\expandafter\@gobble\string#1@box
    \endcsname{}}}
\def\@@sqrt#1{\radical"270370 {#1}}
\def\underline#1{\RIfM@\@@underline{#1}%
  \else $\m@th\@@underline{\hbox{#1}}$\fi}
\let\@@overline\overline
\def\overline#1{\@@overline{#1}}
\Invalid@\leftroot
\Invalid@\uproot
\newcount\uproot@
\newcount\leftroot@
\def\root{\relaxnext@
  \DN@{\ifx\next\uproot\let\next@\nextii@\else
   \ifx\next\leftroot\let\next@\nextiii@\else
   \let\next@\plainroot@\fi\fi\next@}%
  \def\nextii@\uproot##1{\uproot@##1\relax\FN@\nextiv@}%
  \def\nextiv@{\ifx\next\@sptoken\DN@. {\FN@\nextv@}\else
   \DN@.{\FN@\nextv@}\fi\next@.}%
  \def\nextv@{\ifx\next\leftroot\let\next@\nextvi@\else
   \let\next@\plainroot@\fi\next@}%
  \def\nextvi@\leftroot##1{\leftroot@##1\relax\plainroot@}%
   \def\nextiii@\leftroot##1{\leftroot@##1\relax\FN@\nextvii@}%
  \def\nextvii@{\ifx\next\@sptoken
   \DN@. {\FN@\nextviii@}\else
   \DN@.{\FN@\nextviii@}\fi\next@.}%
  \def\nextviii@{\ifx\next\uproot\let\next@\nextix@\else
   \let\next@\plainroot@\fi\next@}%
  \def\nextix@\uproot##1{\uproot@##1\relax\plainroot@}%
  \bgroup\uproot@\z@\leftroot@\z@\FN@\next@}
\def\plainroot@#1\of#2{\setbox\rootbox\hbox{%
 $\m@th\scriptscriptstyle{#1}$}%
 \mathchoice{\r@@t\displaystyle{#2}}{\r@@t\textstyle{#2}}
 {\r@@t\scriptstyle{#2}}{\r@@t\scriptscriptstyle{#2}}\egroup}
\def\r@@t#1#2{\setboxz@h{$\m@th#1\@@sqrt{#2}$}%
 \dimen@\ht\z@\advance\dimen@-\dp\z@
 \setbox@ne\hbox{$\m@th#1\mskip\uproot@ mu$}%
 \advance\dimen@ by1.667\wd@ne
 \mkern-\leftroot@ mu\mkern5mu\raise.6\dimen@\copy\rootbox
 \mkern-10mu\mkern\leftroot@ mu\boxz@}
\def\boxed#1{\fbox{\m@th$\displaystyle#1$}}
\begingroup
 \def\do{\noexpand\do\noexpand}
 \xdef\@preamblecmds{\@preamblecmds
                     \do \numberwithin
                     \do \UseAMSsymbols
                     \do \newsymbol}
\endgroup
\def\new@ifnextchar#1#2#3{%
  \let\@tempe #1\def\@tempa{#2}\def\@tempb{#3}\futurelet
    \@tempc\new@ifnch}

\def\new@ifnch{\ifx\@tempc \@tempe \let\@tempd\@tempa
             \else\let\@tempd\@tempb\fi\@tempd}

\def\new@ifstar#1#2{\new@ifnextchar *{\def\@tempa*{#1}\@tempa}{#2}}
\def\setb@ck{\iffirstchoice@\global\advance\c@equation\m@ne\fi}
\newcount\dspbrk@lvl
\dspbrk@lvl=-1
\interdisplaylinepenalty\@M
\def\allowdisplaybreaks{%
  \new@ifnextchar [\allowdspbrks@{\allowdspbrks@[4]}}
\def\allowdspbrks@[#1]{%
  \interdisplaylinepenalty\getdsp@pen{#1}}
\def\getdsp@pen#1{%
  \ifcase #1\relax \@M
    \or 9999
    \or 6999
    \or 2999
    \or \z@\fi}
\Invalid@\displaybreak

\def\displaybreak@{%
  \def\displaybreak{\new@ifnextchar[\dspbrk@{\dspbrk@[4]}}}

\def\dspbrk@[#1]{\global\dspbrk@lvl #1\relax}
\def\math@cr{{\ifnum0=`}\fi
  \new@ifstar{\global\@eqpen\@M\math@cr@}%
          {\global\@eqpen
             \ifnum\dspbrk@lvl <\z@ \interdisplaylinepenalty
              \else -\@getpen\dspbrk@lvl \fi
           \math@cr@}}
\def\math@cr@{\new@ifnextchar[\math@cr@@{\math@cr@@[\z@]}}
\def\math@cr@@[#1]{\ifnum0=`{\fi}\math@cr@@@
  \noalign{\vskip#1\relax}}
\def\Let@{\let\\\math@cr}
\def\restore@math@cr{\def\math@cr@@@{\cr}}
\restore@math@cr
\Invalid@\intertext
\def\intertext@{\def\intertext##1{\noalign{\vskip\belowdisplayskip
 \vbox{\normalbaselines\noindent##1}\vskip\abovedisplayskip}}}
\newhelp\tag@help
  {tag cannot be used at this point.\space
   If you don't understand why^^Jyou should consult
   the documentation.^^JBut don't worry: just continue, and I'll
   forget what happened.}
\def\gobble@tag{\new@ifstar\@gobble\@gobble}
\def\invalid@tag#1{\err@{#1}{\the\tag@help}\gobble@tag}
\def\dft@tag{\invalid@tag{\string\tag\space not allowed here}}
\def\default@tag{\let\tag\dft@tag}
\default@tag
\def\maketag@@{\new@ifstar\maketag@@@\tagform@}
\def\maketag@@@#1{\hbox{\m@th\rm#1}}
\def\tagform@#1{\hbox{\m@th\normalshape(\ignorespaces#1\unskip)}}
\def\thetag{\leavevmode\tagform@}
\def\make@df@tag{\new@ifstar\make@df@tag@@\make@df@tag@@@}
\def\make@df@tag@@#1{%
  \def\@currentlabel{#1}%
  \gdef\df@tag{\maketag@@@{#1}}}
\def\make@df@tag@@@#1{%
  \def\@currentlabel{#1}%
  \gdef\df@tag{\tagform@{#1}}}
\def\notag{\nonumber}
\newif\iftagsleft@
\tagsleft@true
\def\@eqnnum{\hbox to .01pt{}\rlap{\normalshape
    \hskip -\displaywidth\tagform@\theequation}}
\def\multilimits@{\bgroup
  \Let@
  \restore@math@cr
  \default@tag
 \baselineskip\fontdimen10 \scriptfont\tw@
 \advance\baselineskip\fontdimen12 \scriptfont\tw@
 \lineskip\thr@@\fontdimen8 \scriptfont\thr@@
 \lineskiplimit\lineskip
 \vbox\bgroup\ialign\bgroup\hfil$\m@th\scriptstyle{##}$\hfil\crcr}
\def\Sb{_\multilimits@}
\def\Sp{^\multilimits@}
\def\endSb{\crcr\egroup\egroup\egroup}
\let\endSp=\endSb
\def\smallmatrix{\null\,\vcenter\bgroup
 \Let@\restore@math@cr\default@tag
 \baselineskip6\ex@ \lineskip1.5\ex@ \lineskiplimit\lineskip
 \ialign\bgroup\hfil$\m@th\scriptstyle{##}$\hfil&&\thickspace\hfil
 $\m@th\scriptstyle{##}$\hfil\crcr}
\def\endsmallmatrix{\crcr\egroup\egroup\,}
\newcount\c@MaxMatrixCols
\c@MaxMatrixCols=10

\def\matrix{\hskip -\arraycolsep\array{*\c@MaxMatrixCols c}}
\def\endmatrix{\endarray \hskip -\arraycolsep}
\@ifundefined{prepnext@tok}{%
 \begingroup
  \lccode`\~`\@
  \lowercase{%
   \gdef\@array[#1]#2{\setbox\@arstrutbox\hbox{\vrule
     \@height\arraystretch \ht\strutbox
     \@depth\arraystretch \dp\strutbox
     \@width\z@}\let~@%
\@mkpream{#2}\edef\@preamble{\ialign \noexpand\@halignto
\bgroup \tabskip\z@ \@arstrut \@preamble \tabskip\z@ \cr}%
\def~{\FN@\at@}%
\let\@startpbox\@@startpbox \let\@endpbox\@@endpbox
  \if #1t\vtop \else \if#1b\vbox \else \vcenter \fi\fi
  \bgroup \let\par\@empty
  \let\@sharp##\let\protect\relax
  \lineskip\z@\baselineskip\z@\@preamble}}%
 \endgroup}{}
\def\cases{\left\{\def\arraystretch{1.2}\hskip-\arraycolsep
  \array{l@{\quad}l}}
\def\endcases{\endarray\hskip-\arraycolsep\right.}
\newif\ifinany@
\newif\ifinalign@
\newif\ifingather@
\newcount\and@
\newif\iftag@
\newhelp\andhelp@
{An extra & here is so disastrous that you should probably exit^^J
and fix things up.}
\newif\ifst@rred
\newtoks\@envbody
\def\addto@envbody#1{\@envbody\expandafter{\the\@envbody#1}}
\def\collect@body#1{%
  \@envbody{}%
  \def\process@envbody{%
    \expandafter#1\expandafter{\the\@envbody}}%
  \expandafter\let\csname\@currenvir\endcsname\collect@@body
  \csname\@currenvir\endcsname}
\def\collect@@body#1\end#2{%
  \def\@tempa{#2}%
  \ifx\@tempa\@currenvir
    \addto@envbody{#1}%
    \expandafter\edef\csname\@currenvir\endcsname
      {\noexpand\process@envbody\noexpand\end{\@tempa}}%
  \else
    \addto@envbody{#1\end{#2}}%
  \fi
  \csname\@currenvir\endcsname}
\def\aligned{\RIfM@\else\nonmatherr@{\begin{aligned}}\fi
  \null\,\new@ifnextchar[{\aligned@}{\aligned@[c]}}
\def\aligned@[#1]{%
  \if #1t\vtop \else \if#1b\vbox \else \vcenter \fi\fi
  \bgroup
   \Let@\restore@math@cr
   \default@tag
   \ifinany@\else\openup\jot\fi
   \ialign\bgroup\hfil\strut@$\m@th\displaystyle{##}$&%
    $\m@th\displaystyle{{}##}$\hfil\crcr}
\def\endaligned{\crcr\egroup\egroup}
\newcount\atcount@
\def\doat@#1{\toks@{\hfil\strut@$\m@th
  \displaystyle{\the\hashtoks@}$&$\m@th\displaystyle
  {{}\the\hashtoks@}$\hfil}%
 \atcount@#1\relax\advance\atcount@\m@ne
 \loop\ifnum\atcount@>\z@\toks@\expandafter{\the\toks@&\hfil$\m@th
  \displaystyle{\the\hashtoks@}$&$\m@th
  \displaystyle{{}\the\hashtoks@}$\hfil}\advance
 \atcount@\m@ne\repeat
 \xdef\preamble@{\the\toks@}\xdef\preamble@@{\preamble@}}
\def\alignedat#1{\null\,\vcenter\bgroup\doat@{#1}\Let@
 \restore@math@cr\default@tag
 \ifinany@\else\openup\jot\fi\ialign\bgroup\span\preamble@@\crcr}
\let\endalignedat =\endaligned
\def\gathered{\RIfM@\else\nonmatherr@{\begin{gathered}}\fi
 \null\,\vcenter\bgroup\Let@\restore@math@cr
 \ifinany@\else\openup\jot\fi\ialign
 \bgroup\hfil\strut@$\m@th\displaystyle{##}$\hfil\crcr}

\let\endgathered =\endaligned
\def\tag@in@align{%
  \iftag@\DN@{\invalid@tag{Multiple \string\tag}}\else
   \global\tag@true
   \if@eqnsw\global\@eqnswfalse\fi
   \let\next@\make@df@tag\fi
  \next@}
\def\math@cr@@@align{%
  \if@eqnsw\global\tag@true\fi
  \iftag@
   \ifcase\and@
    \DN@{&&}\else
    \DN@{&}\fi\else
    \let\next@\relax\fi
  \next@
  \relax
  \if@eqnsw\tagform@\theequation\stepcounter{equation}\else
  \iftag@\df@tag\fi\fi
  \global\@eqnswtrue\cr}
\def\Tag@{\iftag@\else\err@{Extra & on this line}{\the\andhelp@}\fi}
\newdimen\lwidth@
\newdimen\rwidth@
\newdimen\maxlwidth@
\newdimen\maxrwidth@
\newdimen\totwidth@
\def\measure@#1{\lwidth@\z@\rwidth@\z@\maxlwidth@\z@\maxrwidth@\z@
 \global\and@\z@
 \setbox@ne\vbox{%
   \everycr{\noalign{\global\tag@false\global\and@\z@}}\Let@
   \let\tag\gobble@tag
   \firstchoice@false
    \halign{\setboxz@h{$\m@th\displaystyle{\@lign##}$}%
     \global\lwidth@\wdz@
     \ifdim\lwidth@>\maxlwidth@\global\maxlwidth@\lwidth@\fi
     \global\advance\and@\@ne
     &\setboxz@h{$\m@th\displaystyle{{}\@lign##}$}%
     \global\rwidth@\wdz@
     \ifdim\rwidth@>\maxrwidth@\global\maxrwidth@\rwidth@\fi
     \global\advance\and@\@ne
     &\Tag@\@gobble{##}\crcr#1\crcr}}%
 \totwidth@\maxlwidth@\advance\totwidth@\maxrwidth@}
\def\displ@y{\global\dt@ptrue\openup\jot\m@th
  \everycr{\noalign{\ifdt@p \global\dt@pfalse
      \vskip-\lineskiplimit \vskip\normallineskiplimit
      \else \penalty\@eqpen \fi}}}
\def\displ@y@{\global\dt@ptrue\openup\jot
  \everycr{\noalign{\global\tag@false
                   \global\and@\z@
                   \global\dspbrk@lvl\m@ne
                   \ifdt@p\global\dt@pfalse
      \vskip-\lineskiplimit\vskip\normallineskiplimit\else
      \penalty\@eqpen\fi}}}
\def\black@#1{\noalign{\ifdim#1>\displaywidth
 \dimen@\prevdepth\nointerlineskip
 \vskip-\ht\strutbox@\vskip-\dp\strutbox@
 \vbox{\noindent\hbox to#1{\strut@\hfill}}%
 \prevdepth\dimen@
 \fi}}
\def\align{\ifingather@
  {\ifnum0=`}\fi
  \DN@{\@nameuse{align (in \string\gather)}}%
  \else \ifmmode\nomath@env
    \DN@{\let\endalign\relax\@gobble}\else
  $$\stepcounter{equation}%
  \st@rredfalse\let\next@\align@\fi\fi
 \collect@body\next@}
\@namedef{align*}{\ifingather@
  {\ifnum0=`}\fi
  \DN@{\@nameuse{align* (in \string\gather)}}\else
   \ifmmode\nomath@env
    \DN@{\@namedef{endalign*}{}\@gobble}\else
   $$\st@rredtrue
  \let\next@\align@\fi\fi
 \collect@body\next@}
\newdimen\lineht@
\def\align@{\inalign@true\inany@true
 \displaybreak@\intertext@
 \let\math@cr@@@\math@cr@@@align
 \let\tag\tag@in@align
 \global\and@\z@\global\dspbrk@lvl\m@ne
 \iftagsleft@\DN@{\@nameuse{align }}\else
  \DN@{\@nameuse{align \space}}\fi\next@}
\@namedef{align }#1{%
 \measure@{#1}\global\and@\z@\global\dspbrk@lvl\m@ne
 \ifdim\totwidth@>\displaywidth\let\displaywidth@\totwidth@\else
  \let\displaywidth@\displaywidth\fi
 \ifingather@\everycr{\noalign{\global\and@\z@
                      \global\dspbrk@lvl\m@ne}}\else\displ@y@\fi
 \Let@
 \ifst@rred\else\let\@currentlabel\theequation\fi
 \tabskip\@centering\halign to\displaywidth\bgroup
  \ifst@rred\nonumber\fi
  \hfil\strut@
  \setboxz@h{\global\tag@false$\m@th\displaystyle{\@lign##}$}%
  \global\lwidth@\wdz@\global\lineht@\ht\z@
  \boxz@\global\advance\and@\@ne
  \tabskip\z@skip&\setboxz@h{$\m@th\displaystyle{{}\@lign##}$}%
  \global\rwidth@\wdz@\ifdim\ht\z@>\lineht@\global\lineht@\ht\z@\fi
  \boxz@\hfil\global\advance\and@\@ne
  \tabskip\@centering&\kern-\displaywidth@
  \setboxz@h{\@lign\strut@{##}}%
  \dimen@\displaywidth\advance\dimen@-\totwidth@
  \divide\dimen@\tw@\advance\dimen@\maxlwidth@\advance\dimen@-\lwidth@
  \ifdim\dimen@<\tw@\wdz@
   \rlap{\vbox{\normalbaselines\boxz@\vbox to\lineht@{}}}\else
   \rlap{\boxz@}\fi
  \tabskip\displaywidth@\crcr#1}
\@namedef{align \space}#1{%
 \measure@{#1}\global\and@\z@\global\dspbrk@lvl\m@ne
 \ifingather@\everycr{\noalign{\global\and@\z@
                  \global\dspbrk@lvl\m@ne}}\else\displ@y@\fi
 \Let@
 \ifst@rred\else\let\@currentlabel\theequation\fi
 \tabskip\@centering
 \halign to\displaywidth\bgroup
  \ifst@rred\nonumber\fi
  \hfil\strut@
  \setboxz@h{\global\tag@false$\m@th\displaystyle{\@lign##}$}%
  \global\lwidth@\wdz@\boxz@\global\advance\and@\@ne
  \tabskip\z@skip
  &\setboxz@h{$\m@th\displaystyle{{}\@lign##}$}%
  \global\rwidth@\wdz@\boxz@\hfill\global\advance\and@\@ne
  \tabskip\@centering
  &\setboxz@h{\@lign\strut@{##}}%
  \dimen@\displaywidth\advance\dimen@-\totwidth@
  \divide\dimen@\tw@\advance\dimen@\maxrwidth@\advance\dimen@-\rwidth@
  \ifdim\dimen@<\tw@\wdz@\llap{\vtop{\normalbaselines\null\boxz@}}%
  \else\llap{\boxz@}\fi
  \tabskip\z@skip
  \crcr#1}
\def\endalign{\math@cr@@@align
  \black@\totwidth@
  \egroup$$\global\@ignoretrue\setb@ck}

\@namedef{endalign*}{\math@cr@@@align\black@\totwidth@
  \egroup$$\global\@ignoretrue}
\@namedef{align (in \string\gather)}{%
  \ifst@rred\stepcounter{equation}\fi
  \def\endalign{\@nameuse{endalign (in \string\gather)}\ifnum0=`{\fi}}%
  \vcenter\bgroup\st@rredfalse
    \collect@body\align@}
\@namedef{endalign (in \string\gather)}{%
  \math@cr@@@align\black@\totwidth@
  \egroup\egroup
  \ifst@rred\setb@ck\fi% this ifst@rred is set by the enclosing gather
  \global\tag@false\global\@eqnswfalse}
\@namedef{align* (in \string\gather)}{%
  \@namedef{endalign*}{\@nameuse{endalign* (in \string\gather)}%
                       \ifnum0=`{\fi}}%
  \vcenter\bgroup\st@rredtrue
    \collect@body\align@}
\@namedef{endalign* (in \string\gather)}{%
  \math@cr@@@align\black@\totwidth@\egroup\egroup
  \global\tag@false\global\@eqnswfalse}
\newif\ifxat@
\def\alignat#1{%
 \ifmmode\nomath@env\DN@{\let\endalignat\relax\@gobble}\else$$%
 \st@rredfalse\stepcounter{equation}\let\@currentlabel\theequation
 \DN@{\@nameuse{alignat }#1}\fi
 \collect@body\next@}
\@namedef{alignat*}#1{%
 \ifmmode\nomath@env\DN@{\@namedef{endalignat*}{}\@gobble}\else$$%
 \st@rredtrue
 \DN@{\@nameuse{alignat }#1}\fi
 \collect@body\next@}
\newif\ifmeasuring@
\newbox\savealignat@
\def\math@cr@@@alignat{%
  \if@eqnsw\global\tag@true\fi
  \iftag@
   \multiply\count@\tw@
   \xdef\next@{}\loop\ifnum\count@>\and@\xdef\next@{&\next@}%
    \advance\count@\m@ne\repeat\else
   \let\next@\relax\fi
  \next@
  \relax
  \if@eqnsw\tagform@\theequation\stepcounter{equation}\else
  \iftag@\df@tag\fi\fi
  \global\@eqnswtrue\cr}%
\@namedef{alignat }#1#2{%
 \inany@true\xat@false
 \let\tag\tag@in@align
 \def\math@cr@@@{\count@#1\relax\math@cr@@@alignat}%
 \displaybreak@\intertext@
 \displ@y@\measuring@true
 \setbox\savealignat@\hbox{$\m@th\displaystyle\Let@
  \attag@{#1}%
  \vbox{\firstchoice@false\halign{\span\preamble@@\crcr#2\crcr}}$}%
 \measuring@false
 \Let@
 \ifst@rred\else\global\@eqnswtrue\fi
 \attag@{#1}%
 \tabskip\@centering\halign to\displaywidth\bgroup
  \ifst@rred\nonumber\fi
  \span\preamble@@\crcr#2}
\def\endalignat{\math@cr@@@\black@{\wd\savealignat@}%
     \egroup\setb@ck$$\global\@ignoretrue}
\@namedef{endalignat*}{\math@cr@@@\black@{\wd\savealignat@}\egroup
  $$\global\@ignoretrue}
\def\xalignat#1{%
 \ifmmode\nomath@env\DN@{\let\endxalignat\relax\@gobble}\else$$%
 \st@rredfalse\stepcounter{equation}\let\@currentlabel\theequation
 \DN@{\@nameuse{xalignat }#1}\fi
 \collect@body\next@}
\@namedef{xalignat*}#1{%
 \ifmmode\nomath@env\DN@{\@namedef{endxalignat*}{}\@gobble}\else$$%
 \st@rredtrue
 \DN@{\@nameuse{xalignat }#1}\fi
 \collect@body\next@}
\let\endxalignat=\endalignat

\expandafter\let\csname endxalignat*\expandafter
  \endcsname\csname endalignat*\endcsname
\@namedef{xalignat }#1#2{%
 \inany@true\xat@true
 \let\tag\tag@in@align
 \def\math@cr@@@{\count@#1\relax\math@cr@@@alignat}%
 \displaybreak@\intertext@
 \displ@y@\measuring@true
 \setbox\savealignat@\hbox{$\m@th\displaystyle\Let@
  \attag@{#1}\vbox{\firstchoice@false
   \halign{\span\preamble@@\crcr#2\crcr}}$}%
 \measuring@false
 \Let@
 \ifst@rred\else\global\@eqnswtrue\fi
  \attag@{#1}\tabskip\@centering\halign to\displaywidth\bgroup
   \span\preamble@@\crcr#2}
\def\attag@#1{%
 \let\TAG@\Tag@\let\Tag@0%
 \ifmeasuring@\def\llap@##1{\setboxz@h{##1}\hbox to\tw@\wdz@{}}%
  \def\rlap@##1{\setboxz@h{##1}\hbox to\tw@\wdz@{}}\else
  \let\llap@\llap\let\rlap@\rlap\fi
 \toks@{\hfil\strut@$\m@th\displaystyle{\@lign\the\hashtoks@}$%
  \tabskip\z@skip
  \global\advance\and@\@ne
  &$\m@th\displaystyle{{}\@lign\the\hashtoks@}$\hfil
  \ifxat@\tabskip\@centering\fi\global\advance\and@\@ne}%
 \iftagsleft@
  \@temptokena{\tabskip\@centering&\Tag@\kern-\displaywidth
   \rlap@{\@lign
     \the\hashtoks@
    }%
   \global\advance\and@\@ne\tabskip\displaywidth}\else
  \@temptokena{\tabskip\@centering&\Tag@\llap@{\@lign
   \the\hashtoks@
  }\global\advance\and@\@ne\tabskip\z@skip}\fi
 \atcount@#1\relax\advance\atcount@\m@ne
 \loop\ifnum\atcount@>\z@
 \toks@\expandafter{\the\toks@&\hfil$\m@th\displaystyle{\@lign
  \the\hashtoks@}$\global\advance\and@\@ne
  \tabskip\z@skip
  &$\m@th\displaystyle{{}\@lign\the\hashtoks@}$\hfil\ifxat@
  \tabskip\@centering\fi\global\advance\and@\@ne}\advance\atcount@\m@ne
 \repeat
 \xdef\preamble@{\the\toks@\the\@temptokena}%
 \xdef\preamble@@{\preamble@}%
 \let\Tag@\TAG@}
\def\xxalignat#1{%
 \ifmmode\nomath@env\DN@{\let\endxxalignat\relax\@gobble}\else$$%
 \DN@{\@nameuse{xxalignat }#1}\fi
 \collect@body\next@}
\@namedef{xxalignat }#1#2{\inany@true
 \displaybreak@\intertext@
 \displ@y\setbox\savealignat@\hbox{$\m@th\displaystyle\Let@
 \xxattag@{#1}%
 \vbox{\firstchoice@false\halign{\span\preamble@@\crcr#2\crcr}}$}%
 \Let@\xxattag@{#1}\tabskip\z@skip\halign to\displaywidth\bgroup
  \span\preamble@@\crcr#2}
\expandafter\let\expandafter\endxxalignat\csname endxalignat*\endcsname
\def\xxattag@#1{\toks@{\tabskip\z@skip\hfil\strut@
 $\m@th\displaystyle{\the\hashtoks@}$&%
 $\m@th\displaystyle{{}\the\hashtoks@}$\hfil\tabskip\@centering&}%
 \atcount@#1\relax\advance\atcount@\m@ne\loop\ifnum\atcount@>\z@
 \toks@
  \expandafter
   {\the\toks@&\hfil$\m@th\displaystyle{\the\hashtoks@}$%
  \tabskip\z@skip&$\m@th\displaystyle{{}\the\hashtoks@}$\hfil
  \tabskip\@centering}\advance\atcount@\m@ne\repeat
 \xdef\preamble@{\the\toks@\tabskip\z@skip}\xdef\preamble@@{\preamble@}}
\newdimen\gwidth@
\newdimen\gmaxwidth@
\def\gmeasure@#1{\gwidth@\z@\gmaxwidth@\z@\setbox@ne\vbox{\Let@
 \firstchoice@false\let\tag\gobble@tag
 \halign{\setboxz@h{$\m@th\displaystyle{##}$}\global\gwidth@\wdz@
 \ifdim\gwidth@>\gmaxwidth@\global\gmaxwidth@\gwidth@\fi
 &\@gobble{##}\crcr#1\crcr}}}
\def\math@cr@@@gather{%
  \if@eqnsw\global\tag@true\fi
  \iftag@
   \DN@{&\relax\if@eqnsw\tagform@\theequation\stepcounter{equation}
                 \else\iftag@\df@tag\fi\fi}\else
   \let\next@\relax\fi
  \next@
  \global\@eqnswtrue\cr}
\def\gather{%
 \ifmmode\nomath@env\DN@{\let\endgather\relax\@gobble}\else $$%
  \ingather@true\inany@true
  \stepcounter{equation}%
  \let\tag\tag@in@align\st@rredfalse
  \displaybreak@\intertext@
  \displ@y
  \Let@\let\@currentlabel\theequation
  \let\math@cr@@@\math@cr@@@gather
  \iftagsleft@\DN@{\@nameuse{gather }}\else
   \DN@{\@nameuse{gather \space}}\fi\fi
 \collect@body\next@}
\@namedef{gather*}{%
 \ifmmode\nomath@env\DN@{\@namedef{endgather*}{}\@gobble}\else $$%
  \ingather@true\inany@true
  \let\tag\tag@in@align\st@rredtrue
  \displaybreak@\intertext@
  \displ@y\Let@
  \let\math@cr@@@\math@cr@@@gather
  \iftagsleft@\DN@{\@nameuse{gather }}\else
   \DN@{\@nameuse{gather \space}}\fi\fi
 \collect@body\next@}
\newdimen\glineht@
\@namedef{gather \space}#1{%
 \gmeasure@{#1}\global\dt@ptrue\tabskip\@centering
 \halign to\displaywidth\bgroup
  \ifst@rred\nonumber\else\global\@eqnswtrue\fi
  \hfil\strut@\setboxz@h{\global\tag@false$\m@th\displaystyle{##}$}%
  \global\gwidth@\wdz@\boxz@\hfil&
  \setboxz@h{\strut@{##}}%
  \dimen@\displaywidth\advance\dimen@-\gwidth@
  \ifdim\dimen@>\tw@\wdz@\llap{\boxz@}\else
  \llap{\vtop{\normalbaselines\null\boxz@}}\fi
  \tabskip\z@skip\crcr#1}
\def\endgather{\math@cr@@@
  \black@\gmaxwidth@\egroup $$\setb@ck\global\@ignoretrue}

\@namedef{endgather*}{\math@cr@@@
  \black@\gmaxwidth@\egroup $$\global\@ignoretrue}
\@namedef{gather }#1{%
 \gmeasure@{#1}\global\dt@ptrue
 \ifdim\gmaxwidth@>\displaywidth\let\gdisplaywidth@\gmaxwidth@\else
 \let\gdisplaywidth@\displaywidth\fi\tabskip\@centering
 \halign to\displaywidth\bgroup
  \ifst@rred\nonumber\else\global\@eqnswtrue\fi
  \hfil\strut@\setboxz@h{\global\tag@false$\m@th\displaystyle{##}$}%
  \global\gwidth@\wdz@
  \global\glineht@\ht\z@\boxz@\hfil&\kern-\gdisplaywidth@
  \setboxz@h{\strut@{##}}%
  \dimen@\displaywidth\advance\dimen@-\gwidth@
  \ifdim\dimen@>\tw@\wdz@\rlap{\boxz@}\else
  \rlap{\vbox{\normalbaselines\boxz@\vbox to\glineht@{}}}\fi
  \tabskip\gdisplaywidth@\crcr#1}
\def\split{%
 \ifinany@\let\next@\insplit@\else
  \DN@{\err@{\string\begin{split} is not allowed
    here.  Try the `aligned' environment.}\@ehb}\fi
 \next@}
\def\insplit@{\global\setbox\z@\vbox\bgroup
  \Let@ \restore@math@cr \default@tag % disallow use of \tag here
  \ialign\bgroup \hfil\strut@
   $\m@th\displaystyle{##}$&$\m@th\displaystyle{{}##}$\hfill\crcr}
\def\endsplit{\crcr\egroup\egroup
 \iftagsleft@\expandafter\lendsplit@\else
  \expandafter\rendsplit@\fi}
\def\rendsplit@{\global\setbox9 \vbox
 {\unvcopy\z@\global\setbox8 \lastbox\unskip}%
 \setbox@ne\hbox{\unhcopy8 \unskip\global\setbox\tw@\lastbox
 \unskip\global\setbox\thr@@\lastbox}%
 \global\setbox7 \hbox{\unhbox\tw@\unskip}%
 \ifinalign@\ifctagsplit@
  \gdef\split@{\hbox to\wd\thr@@{}&
   \vcenter{\vbox{\moveleft\wd\thr@@\boxz@}}}%
 \else\gdef\split@{&\vbox{\moveleft\wd\thr@@\box9}\crcr
  \box\thr@@&\box7}\fi
 \else
  \ifctagsplit@\gdef\split@{\vcenter{\boxz@}}\else
  \gdef\split@{\box9\crcr\hbox{\box\thr@@\box7}}\fi
 \fi
 \aftergroup\split@}
\def\lendsplit@{\global\setbox9\vtop{\unvcopy\z@}%
 \setbox@ne\vbox{\unvcopy\z@\global\setbox8\lastbox}%
 \setbox@ne\hbox{\unhcopy8\unskip\setbox\tw@\lastbox
  \unskip\global\setbox\thr@@\lastbox}%
 \ifinalign@\ifctagsplit@
  \gdef\split@{\hbox to\wd\thr@@{}&
  \vcenter{\vbox{\moveleft\wd\thr@@\box9}}}%
  \else
  \gdef\split@{\hbox to\wd\thr@@{}&\vbox{\moveleft\wd\thr@@\box9}}\fi
 \else
  \ifctagsplit@\gdef\split@{\vcenter{\box9}}\else
  \gdef\split@{\box9}\fi
 \fi\aftergroup\split@}
\newdimen\multlinegap
\multlinegap10pt
\newdimen\multlinetaggap@
\multlinetaggap@10pt
\def\multline{%
 \ifmmode\nomath@env\DN@{\let\endmultline\relax\@gobble}%
 \else $$\DN@{\collect@body\multline@}\fi
 \st@rredfalse\@eqnswtrue \let\@currentlabel\theequation
 \stepcounter{equation}\next@}
\@namedef{multline*}{%
 \ifmmode\nomath@env\DN@{\@namedef{endmultline*}{}\@gobble}%
 \else $$\DN@{\collect@body\multline@}\fi
 \st@rredtrue\@eqnswfalse \let\@currentlabel\@empty
 \next@}
\def\multline@{\inany@true\displaybreak@
 \global\tag@false \let\tag\tag@in@align
 \iftagsleft@
  \expandafter\lmultline@@\else
  \expandafter\rmultline@@\fi}
\newdimen\mwidth@
\def\rmmeasure@#1{%
 \def\shoveleft##1{##1}\def\shoveright##1{##1}%
 \setbox@ne\vbox{\firstchoice@false\Let@\halign{\setboxz@h
  {$\m@th\@lign\displaystyle{}##$}\global\mwidth@\wdz@
  \crcr#1\crcr}}}
\newdimen\mlineht@
\newif\ifzerocr@
\newif\ifonecr@
\def\lmmeasure@#1{\global\zerocr@true\global\onecr@false
 \everycr{\noalign{\ifonecr@\global\onecr@false\fi
  \ifzerocr@\global\zerocr@false\global\onecr@true\fi}}%
  \def\shoveleft##1{##1}\def\shoveright##1{##1}%
 \setbox@ne\vbox{\Let@\firstchoice@false\halign{\setboxz@h
  {$\m@th\@lign\displaystyle{}##$}\ifonecr@\global\mwidth@\wdz@
  \global\mlineht@\ht\z@\fi\crcr#1\crcr}}}
\newbox\mtagbox@
\newdimen\ltwidth@
\newdimen\rtwidth@
\def\lmultline@@#1{%
 \lmmeasure@{#1}%
 \setbox\mtagbox@\hbox{%
  \iftag@\df@tag\else
   \if@eqnsw
    \global\tag@true
    \tagform@\theequation\fi\fi}%
 \dimen@\mwidth@\advance\dimen@\wd\mtagbox@
 \advance\dimen@\multlinetaggap@
 \ifdim\dimen@>\displaywidth\ltwidth@\z@\else\ltwidth@\wd\mtagbox@\fi
 \lmultline@@@#1}
\def\lmultline@@@{\displ@y
 \def\shoveright##1{##1\hfilneg\hskip\multlinegap}%
 \def\shoveleft##1{\setboxz@h{$\m@th\displaystyle{}##1$}%
  \setbox@ne\hbox{$\m@th\displaystyle##1$}%
  \hfilneg
  \iftag@
   \ifdim\ltwidth@>\z@\hskip\ltwidth@\hskip\multlinetaggap@\fi
  \else\hskip\multlinegap\fi\hskip.5\wd@ne\hskip-.5\wdz@##1}%
  \halign\bgroup\Let@ \let\tag\gobble@tag
   \hbox to\displaywidth
   {\strut@$\m@th\displaystyle\hfil{}##\hfil$}\crcr
   \hfilneg
   \iftag@
    \ifdim\ltwidth@>\z@
     \box\mtagbox@\hskip\multlinetaggap@
    \else
     \rlap{\vbox{\normalbaselines\hbox{\strut@\box\mtagbox@}%
     \vbox to\mlineht@{}}}\fi
   \else\hskip\multlinegap\fi}
\def\rmultline@@#1{%
 \rmmeasure@{#1}%
 \setbox\mtagbox@\hbox{%
  \iftag@\df@tag\else
   \if@eqnsw \global\tag@true
     \tagform@\theequation\fi\fi}%
 \dimen@\mwidth@\advance\dimen@\wd\mtagbox@
 \advance\dimen@\multlinetaggap@
 \ifdim\dimen@>\displaywidth\rtwidth@\z@\else\rtwidth@\wd\mtagbox@\fi
 \rmultline@@@#1}
\def\rmultline@@@{\displ@y
 \def\shoveright##1{##1\hfilneg\iftag@\ifdim\rtwidth@>\z@
  \hskip\rtwidth@\hskip\multlinetaggap@\fi\else\hskip\multlinegap\fi}%
 \def\shoveleft##1{\setboxz@h{$\m@th\displaystyle{}##1$}%
  \setbox@ne\hbox{$\m@th\displaystyle##1$}%
  \hfilneg\hskip\multlinegap\hskip.5\wd@ne\hskip-.5\wdz@##1}%
 \halign\bgroup\Let@\let\tag\gobble@tag
  \hbox to\displaywidth
  {\strut@$\m@th\displaystyle\hfil{}##\hfil$}\crcr
 \hfilneg\hskip\multlinegap}
\def\endmultline{\iftagsleft@\expandafter\lendmultline@\else
  \expandafter\rendmultline@\fi\global\@ignoretrue}
\expandafter\let\csname endmultline*\endcsname=\endmultline
\def\lendmultline@{\hfilneg\hskip\multlinegap\crcr\egroup$$}
\def\rendmultline@{\iftag@
 \ifdim\rtwidth@>\z@
  \hskip\multlinetaggap@\box\mtagbox@
 \else\llap{\vtop{\normalbaselines\null\hbox{\strut@\box\mtagbox@}}}\fi
 \else\hskip\multlinegap\fi
 \hfilneg\crcr\egroup$$}
\expandafter\def
 \expandafter\@arrayparboxrestore
  \expandafter{\@arrayparboxrestore
               \inany@false\ingather@false\inalign@false
   \default@tag}
\def\equation{\gather\Invalid@\\}
\def\endequation{\endgather}
\@namedef{equation*}{\equation\nonumber}
\expandafter\let\csname endequation*\endcsname =\endequation
\endinput
%% 
%% End of file `amstex.sty'.