1% extra.sty : Isabelle Manual extra macros for non-Springer version 2% 3\typeout{Document Style extra. Released 17/2/94, version of 22/8/00} 4 5%%Euro-style date: 20 September 1955 6\def\today{\number\day\space\ifcase\month\or 7January\or February\or March\or April\or May\or June\or 8July\or August\or September\or October\or November\or December\fi 9\space\number\year} 10 11%%%Put first chapter on odd page, with arabic numbering; like \cleardoublepage 12\newcommand\clearfirst{\clearpage\ifodd\c@page\else 13 \hbox{}\newpage\if@twocolumn\hbox{}\newpage\fi\fi 14 \pagenumbering{arabic}} 15 16%%%Ruled chapter headings 17\def\@rulehead#1{\hrule height1pt \vskip 14pt \Huge \bf 18 #1 \vskip 14pt\hrule height1pt} 19\def\@makechapterhead#1{ { \parindent 0pt 20 \ifnum\c@secnumdepth >\m@ne \raggedleft\large\bf\@chapapp{} \thechapter \par 21 \vskip 20pt \fi \raggedright \@rulehead{#1} \par \nobreak \vskip 40pt } } 22 23\def\@makeschapterhead#1{ { \parindent 0pt \raggedright 24 \@rulehead{#1} \par \nobreak \vskip 40pt } } 25 26