\documentclass[11pt,a4paper]{article}
\usepackage{amsmath,amsthm}
\usepackage{isabelle,isabellesym}


% Cross references to other manuals:
\usepackage{xr}
\externaldocument{implementation}
\newcommand{\impref}[1]{\ref{I-#1}}


% further packages required for unusual symbols (see also
% isabellesym.sty), use only when needed

%\usepackage{amssymb}
  %for \<leadsto>, \<box>, \<diamond>, \<sqsupset>, \<mho>, \<Join>,
  %\<lhd>, \<lesssim>, \<greatersim>, \<lessapprox>, \<greaterapprox>,
  %\<triangleq>, \<yen>, \<lozenge>

%\usepackage[greek,english]{babel}
  %option greek for \<euro>
  %option english (default language) for \<guillemotleft>, \<guillemotright>

%\usepackage[latin1]{inputenc}
  %for \<onesuperior>, \<onequarter>, \<twosuperior>, \<onehalf>,
  %\<threesuperior>, \<threequarters>, \<degree>

%\usepackage[only,bigsqcap]{stmaryrd}
  %for \<Sqinter>

%\usepackage{eufrak}
  %for \<AA> ... \<ZZ>, \<aa> ... \<zz> (also included in amssymb)

%\usepackage{textcomp}
  %for \<cent>, \<currency>

% this should be the last package used
\usepackage{pdfsetup}

\urlstyle{rm}
\renewcommand{\isastyletxt}{\isastyletext}% use same formatting for txt and text
\renewcommand{\isastyle}{\isastyleminor}% use same formatting for txt and text
\isadroptag{theory}


\newtheorem{exercise}{Exercise}[section]


\begin{document}

\title{The Isabelle Programmer's Cookbook (fragment)}
\author{Alexander Krauss}
\maketitle

\tableofcontents

% sane default for proof documents
\parindent 0pt\parskip 0.5ex

% generated text of all theories
\input{session}

% optional bibliography
%\bibliographystyle{abbrv}
%\bibliography{root}

\end{document}

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