%\@addtoreset{equation}{section}
%\def\theequation{\thechapter.\arabic{equation}}
 
\@ifundefined{@ptsize}
{\typeout{Warning: A4 option not valid for this document style}}
{\ifcase\@ptsize \typeout{A4 option at 10pt -- Released 19 june 1987}
\if@twoside \oddsidemargin 1.20cm \evensidemargin 2.60cm \marginparwidth 4.0cm
\else \oddsidemargin 1.90cm \evensidemargin 1.90cm \marginparwidth 3.0cm \fi
\marginparsep 0.4cm
 
\topmargin 0cm \headheight 0.42cm \headsep 0.88cm \footheight 0.42cm
\footskip 1cm
 
\textheight 22.5cm \textwidth 12.97cm \columnsep 0.35cm \columnseprule 0cm \or
\typeout{A4 option at 11pt -- Released  Released 19 june 1987} \if@twoside
\oddsidemargin 1.00cm \evensidemargin 2.00cm \marginparwidth 3.2cm \else
\oddsidemargin 1.50cm \evensidemargin 1.50cm \marginparwidth 2.6cm \fi
\marginparsep 0.4cm
 
\topmargin 0cm \headheight 0.00cm \headsep 0.00cm \footheight 0.42cm
\footskip 1cm
 
\textheight 25.0cm \textwidth 16.0cm \columnsep 0.35cm \columnseprule 0cm \or
\typeout{A4 option at 12pt --  Released 19 june 1987} \if@twoside
\oddsidemargin 0.45cm \evensidemargin 1.27cm \marginparwidth 2.4cm \else
\oddsidemargin 0.00cm \evensidemargin 1.00cm \marginparwidth 1.8cm \fi
\marginparsep 0.0cm \headsep 0.00cm \footheight 0.00cm
\footskip 1cm

\topmargin -25mm \headheight 12mm \headsep 10mm \footheight 0.42cm
\footskip 1cm
\textheight 25.0cm \textwidth 16.0cm \columnsep 0.35cm \columnseprule 0cm \else
\typeout{Warning: invalid point-size option for A4 option.} \fi}

