\documentclass[11pt,a4paper]{article}
\usepackage{graphicx,isabelle,isabellesym}
\usepackage{amssymb}
\usepackage[english]{babel}

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

% proper setup for best-style documents
\urlstyle{rm}
\isabellestyle{it}


\begin{document}

\title{ZF}
\author{Lawrence C Paulson and others}
\maketitle

\tableofcontents

\begin{center}
  \includegraphics[width=\textwidth,height=\textheight,keepaspectratio]{session_graph}
\end{center}

\newpage

\renewcommand{\setisabellecontext}[1]{\markright{THEORY~``#1''}}

\parindent 0pt\parskip 0.5ex

% include generated text of all theories
\input{session}

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

\end{document}
