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% extra.sty : Isabelle Manual extra macros for non-Springer version
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%
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\typeout{Document Style extra. Released 17 February 1994}
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%%Euro-style date: 20 September 1955
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\def\today{\number\day\space\ifcase\month\or
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January\or February\or March\or April\or May\or June\or
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July\or August\or September\or October\or November\or December\fi
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\space\number\year}
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\input{alltt.sty}
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%Indented, boxed alltt environment; uses \small\tt font
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%\leftmargini is LaTeX's first-level indentation for items (2.5em)
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%@endparenv is LaTeX's trick for preventing indentation of next paragraph
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\newenvironment{ttbox}{\par\nobreak\vskip-2pt
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\vbox\bgroup\footnotesize\begin{alltt}\chardef\{=`\{\chardef\}=`\}%
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\leftskip\leftmargini}%
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292
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{\end{alltt}\egroup\vskip-7pt\@endparenv}
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\newcommand\ttbreak{\end{ttbox}\vskip-10pt\begin{ttbox}}
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%%%Put first chapter on odd page, with arabic numbering; like \cleardoublepage
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\newcommand\clearfirst{\clearpage\ifodd\c@page\else
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\hbox{}\newpage\if@twocolumn\hbox{}\newpage\fi\fi
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\pagenumbering{arabic}}
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%%%Ruled chapter headings
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\def\@rulehead#1{\hrule height1pt \vskip 14pt \Huge \bf
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#1 \vskip 14pt\hrule height1pt}
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\def\@makechapterhead#1{ { \parindent 0pt
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\ifnum\c@secnumdepth >\m@ne \raggedleft\large\bf\@chapapp{} \thechapter \par
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\vskip 20pt \fi \raggedright \@rulehead{#1} \par \nobreak \vskip 40pt } }
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\def\@makeschapterhead#1{ { \parindent 0pt \raggedright
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\@rulehead{#1} \par \nobreak \vskip 40pt } }
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