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

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

% urls in roman style, theory text in math-similar italics
\urlstyle{rm}
\isabellestyle{it}


\begin{document}

\title{Fun With Tilings}
\author{Tobias Nipkow and Lawrence Paulson}
\maketitle

\begin{abstract}
Tilings are defined inductively. It is shown that one form of mutilated
chess board cannot be tiled with dominoes, while another one can be tiled
with L-shaped tiles.
\end{abstract}


Sections 1 and 2 are by Paulson and described elsewhere~\cite{Paulson}.
Section~3 is by Nipkow and formalizes a well-known argument from the
literature~\cite{Velleman}.

Please add further fun examples of this kind!

\input{session}

\bibliographystyle{plain}
\bibliography{root}

\end{document}
