\documentclass[11pt,a4paper]{article}
\usepackage[T1]{fontenc}
\usepackage{isabelle,isabellesym}
\usepackage{textcomp}

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\usepackage{pdfsetup}

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\urlstyle{rm}
\isabellestyle{it}


\begin{document}

\title{The Perfect Number Theorem}
\author{Mark IJbema}
\maketitle
\begin{abstract}
This document presents the formal proof of the Perfect Number
Theorem. The result can also be found as number 70 on the list of ``top
100 mathematical theorems''~\cite{Wiedijk100}. This document was
produced as result of a B.Sc. Thesis under supervision of Jaap Top and
Wim H. Hesselink (University of Groningen) in 2009.
\end{abstract}
\tableofcontents

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

% generated text of all theories
\input{PerfectBasics}
\input{Sigma}
\input{Perfect}

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\bibliographystyle{alpha}
\bibliography{root}

\end{document}

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