% burgess.sty
% last modified by alison woollatt, 1-nov-2001

% subeqn.sty follows
% Copyright (c) 1990 by Stephen Gildea
% Permission to copy all or part of this work is granted, provided
% that the copies are not made or distributed for resale, and that
% the copyright notice and this notice are retained.
% Modified for use with JFM/LaTeX2e.

\AtBeginDocument{%
  \ifuseAMSsubequ \else
    \global\let\subequations\CUPsubequations
    \global\let\endsubequations\endCUPsubequations
  \fi
}

\newif\ifuseAMSsubequ
\newcommand\useAMSsubequations{\global\useAMSsubequtrue}

\newtoks\@stequation

\newenvironment{CUPsubequations}
  {\refstepcounter{equation}%
   \edef\@savedequation{\the\c@equation}%
   \@stequation=\expandafter{\theequation}%
   \edef\@savedtheequation{\the\@stequation}%
   \edef\oldtheequation{\theequation}%
   \setcounter{equation}\z@
   \def\theequation{\oldtheequation{\itshape\alph{equation}}}}
  {\setcounter{equation}{\@savedequation}%
   \@stequation=\expandafter{\@savedtheequation}%
   \edef\theequation{\the\@stequation}\global\@ignoretrue}

\newcommand\returnthesubequation{%
  \gdef\thesubequation{\theequation{\itshape\@alph\c@subequation}}}

% subeqnarray.sty
% Copyright (C) 1988 by Johannes Braams, Dr Neher Laboratories
% Modified for use with JFM/LaTeX2e.

\newcounter{subequation}[equation]
\renewcommand\thesubequation{\theequation{\itshape\@alph\c@subequation}}
\def\@subeqnnum{{\normalfont\rmfamily (\thesubequation)}}

\newcommand\slabel[1]{\@bsphack % MODIFIED IN LINE WITH LATEX.LTX
  \protected@write\@auxout{}%
    {\string\newlabel{#1}{{\thesubequation}{\thepage}}}%
  \@esphack}

\newenvironment{subeqnarray} % MODIFIED IN LINE WITH LATEX.LTX
  {\stepcounter{equation}%
   \let\@currentlabel=\theequation
   \global\c@subequation\@ne
   \global\@eqnswtrue
   \m@th
   \global\@eqcnt\z@
   \tabskip\@centering
   \let\\\@subeqncr
   $$\everycr{}\halign to\displaywidth\bgroup
     \hskip\@centering$\displaystyle\tabskip\z@skip{##}$\@eqnsel
    &\global\@eqcnt\@ne \hfil${\;##\;}$\hfil
    &\global\@eqcnt\tw@
     $\displaystyle\tabskip\z@skip{##}$\hfil\tabskip\@centering
    &\hb@xt@\z@\bgroup\hss##\egroup
      \tabskip\z@skip \cr}
  {\@@subeqncr\egroup $$\global\@ignoretrue}

\def\@subeqncr{{\ifnum0=`}\fi\@ifstar{\global\@eqpen\@M
    \@ysubeqncr}{\global\@eqpen\interdisplaylinepenalty \@ysubeqncr}}

\def\@ysubeqncr{\@ifnextchar [{\@xsubeqncr}{\@xsubeqncr[\z@]}}

\def\@xsubeqncr[#1]{\ifnum0=`{\fi}\@@subeqncr
   \noalign{\penalty\@eqpen\vskip\jot\vskip #1\relax}}

\def\@@subeqncr{\let\@tempa\relax
    \ifcase\@eqcnt \def\@tempa{& & &}\or \def\@tempa{& &}
      \else \def\@tempa{&}\fi
     \@tempa \if@eqnsw\@subeqnnum\refstepcounter{subequation}\fi
     \global\@eqnswtrue\global\@eqcnt\z@\cr}

\let\@ssubeqncr=\@subeqncr
\newenvironment{subeqnarray*}
  {\def\@subeqncr{\nonumber\@ssubeqncr}\subeqnarray}
  {\global\advance\c@equation\m@ne \nonumber\endsubeqnarray}

\renewenvironment{eqnarray} % MODIFIED IN LINE WITH LATEX.LTX
  {\stepcounter{equation}%
   \let\@currentlabel=\theequation
   \global\@eqnswtrue
   \m@th
   \global\@eqcnt\z@
   \tabskip\@centering
   \let\\\@eqncr
   $$\everycr{}\halign to \displaywidth\bgroup
     \hskip\@centering$\displaystyle\tabskip\z@skip{##}$\@eqnsel
   &\global\@eqcnt\@ne \hfil${\;##\;}$\hfil
   &\global\@eqcnt\tw@
     $\displaystyle\tabskip\z@skip{##}$\hfil \tabskip\@centering
   &\hb@xt@\z@\bgroup\hss##\egroup
     \tabskip\z@skip \cr}
  {\@@eqncr\egroup\global\advance\c@equation\m@ne
   $$\global\@ignoretrue}

% revert to arabic footnotes

\renewcommand\thefootnote{\mbox{\scriptsize\arabic{footnote}}}
\renewcommand\@makefnmark{\@textsuperscript{\normalfont\@thefnmark}} % FROM LATEX.LTX

\newdimen\oneem \oneem=1em
\renewcommand\@makefntext[1]{%
  \@setpar{\@@par\@tempdima \hsize
    \advance\@tempdima-\oneem
    \parshape \@ne \oneem \@tempdima}\par
  \noindent \hb@xt@\z@{\hss\@makefnmark$\,$}#1}

\endinput