src/HOL/HOLCF/Tutorial/document/root.tex

drop redundant cong rules

% HOLCF/document/root.tex

\documentclass[11pt,a4paper]{article}
\usepackage{graphicx,isabelle,isabellesym,latexsym}
\usepackage[only,bigsqcap]{stmaryrd}
\usepackage{textcomp}
\usepackage{pdfsetup}

\urlstyle{rm}
\pagestyle{myheadings}

\begin{document}

\title{Isabelle/HOLCF Tutorial}
\maketitle

\tableofcontents

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

\end{document}