\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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