src/HOL/NumberTheory/document/root.tex

use exec_lub instead of some_lub

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

\urlstyle{rm}
\isabellestyle{it}

\begin{document}

\title{Some results of number theory}
\author{Lawrence C Paulson \\
  Thomas M Rasmussen \\
  Christophe Tabacznyj}
\maketitle

\tableofcontents

\begin{center}
  \includegraphics[scale=0.7]{session_graph}  
\end{center}

\newpage

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

\end{document}