% FLEQN DOCUMENT-STYLE OPTION - released 24 May 1989
%    for LaTeX version 2.09
% Copyright (C) 1989 by Leslie Lamport
% The following commands make the displayed math environments flush left,
% with an indentation of \mathindent from the prevailing left margin.
% Definitions of \[ and \] changed 9 Mar 87 to use \begin{trivlist} ...
% \end{trivlist} instead of simulating it; corrects bug that caused
% following text always to start new paragraph.
% \[ and \equation changed to set \@beginparpenalty and \@endparpenalty
% to \predisplaypenalty and \postdisplaypenalty.  Change made
% 24 May 89, suggested by Rainer Sch\"opf and Frank Mittelbach.
\def\[{\relax\ifmmode\@badmath\else\bgroup\@beginparpenalty\predisplaypenalty
  \@endparpenalty\postdisplaypenalty
  \begin{trivlist}\item[]\leavevmode
  \hbox to\linewidth\bgroup$ % $ TO MAKE 'DOLLAR' NESTING OK
  \displaystyle
  \hskip\mathindent\bgroup\fi}
\def\]{\relax\ifmmode \egroup $\hfil % $ TO MAKE DOLLAR NESTING IN THIS FILE OK
       \egroup \end{trivlist}\egroup\else \@badmath \fi}
\def\equation{\@beginparpenalty\predisplaypenalty
  \@endparpenalty\postdisplaypenalty
\refstepcounter{equation}\trivlist \item[]\leavevmode
  \hbox to\linewidth\bgroup $ % $ TO MAKE DOLLAR NESTING OK
  \displaystyle
\hskip\mathindent}
\def\endequation{$\hfil % $ TO MAKE DOLLAR NESTING IN THIS FILE OK
           \displaywidth\linewidth\@eqnnum\egroup \endtrivlist}
\def\eqnarray{\stepcounter{equation}\let\@currentlabel=\theequation
\global\@eqnswtrue
\global\@eqcnt\z@\tabskip\mathindent\let\\=\@eqncr
\abovedisplayskip\topsep\ifvmode\advance\abovedisplayskip\partopsep\fi
\belowdisplayskip\abovedisplayskip
\belowdisplayshortskip\abovedisplayskip
\abovedisplayshortskip\abovedisplayskip
$$\halign % $$ DOLLAR MATCHING
to \linewidth\bgroup\@eqnsel\hskip\@centering$\displaystyle\tabskip\z@
  {##}$&\global\@eqcnt\@ne \hskip 2\arraycolsep \hfil${##}$\hfil
  &\global\@eqcnt\tw@ \hskip 2\arraycolsep $\displaystyle{##}$\hfil 
   \tabskip\@centering&\llap{##}\tabskip\z@\cr}
\def\endeqnarray{\@@eqncr\egroup
      \global\advance\c@equation\m@ne$$\global\@ignoretrue % $$ MATCHING
      }
\newdimen\mathindent 
\mathindent = \leftmargini