src/CTT/document/root.tex

clarified font_domain: strict excludes e.g. space character;

\documentclass[11pt,a4paper]{article}
\usepackage[utf8]{inputenc}
\usepackage{isabelle,isabellesym}
\usepackage{pdfsetup}

\urlstyle{rm}
\isabellestyle{it}

\begin{document}

\title{Isabelle/CTT --- Constructive Type Theory \\
  with extensional equality and without universes}
\author{Larry Paulson}
\maketitle

\tableofcontents

\parindent 0pt\parskip 0.5ex
\input{session}

\end{document}