%This is eqalign.tex in text format as of 30 July 1987.
% The following definition is straight from PLAIN.TEX
% This file exists as a LaTeX style option to enable users to
% put back something that LaTeX removed from PLAIN but which
% is sorely missed by people who write long equations.
% You should be able to add 'eqalign' to the options list in square
% brackets which specifies the options of any standard LaTeX style.
% This file may also be input into a STY file e.g. the LEPNOTE style
% option includes it automatically.
% Do not attempt to input it anywhere in a LaTeX document.
 
\def\eqalign#1{%
\null\,\vcenter{\openup\jot\m@th
  \ialign{\strut\hfil$\displaystyle{##}$&$\displaystyle{{}##}$\hfil
      \crcr#1\crcr}}\,}
% \eqalign works inside $$ ... $$ or \[ ... \] in LaTeX thanks to the
% above restoration.   This should help remedy the deficiencies of
% the eqnarray environment for long expressions.
% It seems to work also in the equation environment if you put
% the \label command inside an \hbox.
% This seems to resolve a problem with math glue from \eqalign mixing
% with ordinary glue generated by \label.  God help us.
% Use of \eqalign is explained in the TeXbook.
%                       * * Restored at 12:21:30 on 17 Jul 1987 by JOWETT