doc-src/iman.sty

add \<le> to list of "good" symbols;

% iman.sty : Isabelle Manual Page Layout
%
\typeout{Document Style iman. Released 17 February 1994}

\hyphenation{Isa-belle man-u-script man-u-scripts ap-pen-dix mut-u-al-ly}
\hyphenation{data-type data-types co-data-type co-data-types }

\let\ts=\thinspace

%usage: \iflabelundefined{LABEL}{if not defined}{if defined}
\newcommand{\iflabelundefined}[1]{\@ifundefined{r@#1}}


%%%INDEXING  use sedindex to process the index

\newcommand\seealso[2]{\emph{see also} #1}
\usepackage{makeidx}

%index, putting page numbers of definitions in boldface
\def\bold#1{\textbf{#1}}
\newcommand\fnote[1]{#1n}
\newcommand\indexbold[1]{\index{#1|bold}}

%for indexing constants, symbols, theorems, ...
\newcommand\cdx[1]{{\tt#1}\index{#1@{\tt#1} constant}}
\newcommand\sdx[1]{{\tt#1}\index{#1@{\tt#1} symbol}}

\newcommand\tdx[1]{{\tt#1}\index{#1@{\tt#1} theorem}}
\newcommand\tdxbold[1]{{\tt#1}\index{#1@{\tt#1} theorem|bold}}

\newcommand\mltydx[1]{{\tt#1}\index{#1@{\tt#1} ML type}}
\newcommand\xdx[1]{{\tt#1}\index{#1@{\tt#1} exception}}

\newcommand\ndx[1]{{\tt#1}\index{#1@{\tt#1} nonterminal}}
\newcommand\ndxbold[1]{{\tt#1}\index{#1@{\tt#1} nonterminal|bold}}

\newcommand\cldx[1]{{\tt#1}\index{#1@{\tt#1} class}}
\newcommand\tydx[1]{\textit{#1}\index{#1@{\textit{#1}} type}}
\newcommand\thydx[1]{{\tt#1}\index{#1@{\tt#1} theory}}

\newcommand\tooldx[1]{{\tt#1}\index{#1@{\tt#1} tool}}
\newcommand\settdx[1]{{\tt#1}\index{#1@{\tt#1} setting}}

%set argument in \tt font; at the same time, index using * prefix
\newcommand\rmindex[1]{{#1}\index{#1}\@}
\newcommand\ttindex[1]{{\tt#1}\index{*#1}\@}
\newcommand\ttindexbold[1]{{\tt#1}\index{*#1|bold}\@}

%set argument in \bf font and index in ROMAN font (for definitions in text!)
\newcommand\bfindex[1]{{\bf#1}\index{#1|bold}\@}


%%% underscores as ordinary characters, not for subscripting
%%  use @ or \sb for subscripting; use \at for @
%%  only works in \tt font
%%  must not make _ an active char; would make \ttindex fail!
\gdef\underscoreoff{\catcode`\@=8\catcode`\_=\other}
\gdef\underscoreon{\catcode`\_=8\makeatother}
\chardef\other=12
\chardef\at=`\@

% alternative underscore
\def\_{\leavevmode\kern.06em\vbox{\hrule height.2ex width.3em}\hskip0.1em}

%%% \dquotes permits usage of "..." for \hbox{...} -- also taken from under.sty
{\catcode`\"=\active
\gdef\dquotes{\catcode`\"=\active  \let"=\@mathText}%
\gdef\@mathText#1"{\hbox{\mathTextFont #1\/}}}
\def\mathTextFont{\frenchspacing\tt}
\def\dquotesoff{\catcode`\"=\other}

%%%% meta-logical connectives

\let\Forall=\bigwedge
\let\Imp=\Longrightarrow
\let\To=\Rightarrow
\newcommand{\PROP}{\mathop{\mathrm{PROP}}}
\newcommand{\Var}[1]{{?\!#1}}
\newcommand{\All}[1]{\Forall#1.}  %quantification

%%%% ``WARNING'' environment
\def\dbend{\vtop to 0pt{\vss\hbox{\Huge\bf!}\vss}}
\newenvironment{warn}{\medskip\medbreak\begingroup \clubpenalty=10000 
         \small %%WAS\baselineskip=0.9\baselineskip
         \noindent \hangindent\parindent \hangafter=-2 
         \hbox to0pt{\hskip-\hangindent\dbend\hfill}\ignorespaces}%
        {\par\endgroup\medbreak}


%%%% Standard logical symbols
\let\turn=\vdash
\let\conj=\wedge
\let\disj=\vee
\let\imp=\rightarrow
\let\bimp=\leftrightarrow
\newcommand\all[1]{\forall#1.}  %quantification
\newcommand\ex[1]{\exists#1.}
\newcommand{\pair}[1]{\langle#1\rangle}

\newcommand{\lparr}{\mathopen{(\!|}}
\newcommand{\rparr}{\mathclose{|\!)}}
\newcommand{\fs}{\mathpunct{,\,}}
\newcommand{\ty}{\mathrel{::}}
\newcommand{\asn}{\mathrel{:=}}
\newcommand{\more}{\ldots}
\newcommand{\record}[1]{\lparr #1 \rparr}
\newcommand{\dtt}{\mathord.}

\newcommand\lbrakk{\mathopen{[\![}}
\newcommand\rbrakk{\mathclose{]\!]}}
\newcommand\List[1]{\lbrakk#1\rbrakk}  %was \obj
\newcommand\vpile[1]{\begin{array}{c}#1\end{array}}
\newenvironment{matharray}[1]{\[\begin{array}{#1}}{\end{array}\]}
\newcommand{\Text}[1]{\mbox{#1}}

\DeclareMathSymbol{\dshsym}{\mathalpha}{letters}{"2D}
\newcommand{\dsh}{\mathit{\dshsym}}

\let\int=\cap
\let\un=\cup
\let\inter=\bigcap
\let\union=\bigcup

\def\ML{{\sc ml}}
\def\OBJ{{\sc obj}}
\def\AST{{\sc ast}}

%macros to change the treatment of symbols
\def\relsemicolon{\mathcode`\;="303B}   %treat ; like a relation
\def\binperiod{\mathcode`\.="213A}   %treat . like a binary operator
\def\binvert{\mathcode`\|="226A}     %treat | like a binary operator

%redefinition of \sloppy and \fussy to use \emergencystretch
\def\sloppy{\tolerance2000 \hfuzz.5pt \vfuzz.5pt \emergencystretch=15pt}
\def\fussy{\tolerance200 \hfuzz.1pt \vfuzz.1pt \emergencystretch=0pt}

%non-bf version of description
\def\descrlabel#1{\hspace\labelsep #1}
\def\descr{\list{}{\labelwidth\z@ \itemindent-\leftmargin\let\makelabel\descrlabel}}
\let\enddescr\endlist

% The mathcodes for the letters A, ..., Z, a, ..., z are changed to
% generate text italic rather than math italic by default. This makes
% multi-letter identifiers look better. The mathcode for character c
% is set to |"7000| (variable family) + |"400| (text italic) + |c|.
%
\DeclareSymbolFont{italics}{\encodingdefault}{\rmdefault}{m}{it}%
\def\@setmcodes#1#2#3{{\count0=#1 \count1=#3
        \loop \global\mathcode\count0=\count1 \ifnum \count0<#2
        \advance\count0 by1 \advance\count1 by1 \repeat}}
\@setmcodes{`A}{`Z}{"7\hexnumber@\symitalics41}
\@setmcodes{`a}{`z}{"7\hexnumber@\symitalics61}