%%% LaTeX document style option eqname.sty
%%% Gerd Neugebauer 4/92
%%% gene (at) gerd-neugebauer (dot) de
%%% 
%%% Copyright 1992, 1994, 2010 Gerd Neugebauer
%%% You may freely use, modify and/or distribute this file.
%%%
%%% This style option allows named equations as follows
%%%
%%%      		1 + 1 = 2			   (17)
%%%      		1 + 2 = 3			(bingo)
%%%      		1 + 3 = 4			   (18)
%%%
%%% This can be produced by
%%%
%%% \begin{eqnarray}
%%%   1+1=2		\label{e1}\\
%%%   1+2=3		\eqname{bingo}\label{e2}\\
%%%   1+3=4		\label{e3}
%%% \end{eqnarray}
%%%
%%% Note: The \label has to go after the \eqname command.
%%%
%%% Bugs & Problems: 
%%%	This style option does not work with leqno.sty
%%%
%%%----------------------------------------------------------------------------

\newif\if@eqname
\def\@eqname{}
\def\@eqnnum{{\reset@font\rm 
	(\if@eqname\@eqname%
	\addtocounter{equation}{-1}%
	\global\let\@currentlabel=\theequation%
	\global\@eqnamefalse%
	\else\theequation\fi)}}
\def\eqname#1{\xdef\@eqname{#1}\global\@eqnametrue\gdef\@currentlabel{#1}}