src/HOL/Extraction/document/root.tex

handle free variables even more gracefully;
1. show those that only occur in assumptions as part of the constants;
2. make sure locally defined Frees are given an Opt rep, just like constants generally owuld

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

\urlstyle{rm}
\isabellestyle{it}

\begin{document}

\title{Examples for program extraction in Higher-Order Logic}
\author{Stefan Berghofer}
\maketitle

\nocite{Berger-JAR-2001,Coquand93}

\tableofcontents
\newcommand{\isasymbind}{\isamath{\mathbin{>\!\!\!>\mkern-6.7mu=}}}
\newcommand{\isasymthen}{\isamath{\mathbin{>\!\!\!>}}}

\parindent 0pt\parskip 0.5ex

\input{session}

\bibliographystyle{abbrv}
\bibliography{root}

\end{document}