make sure the SMT solver runs several iterations by lowering the timeout at each iteration -- yields better results in practice
\documentclass[11pt,a4paper]{article}
\usepackage{isabelle,isabellesym}
\usepackage{pdfsetup}
\urlstyle{rm}
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\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}