\documentclass{homework651}
\include{hwextras}
\usepackage{graphicx}
\usepackage[all,cmtip]{xy}
\def\net<#1>{\left<#1\right>}

\newcommand{\bbB}{\mathbb{B}}
\doclabel{Math F651: Homework 12}
\docdate{Due: April 25, 2025}
\begin{document}
\begin{problems}

\problem Lee 9-2 (Read ``Free Groups'' 239--240 first)
\problem Lee 9-4 (Read ``Presentations of Groups'', pages 241--243 first)
\problem Lee 10-1 (Wait until Monday to start) 
\problem Lee 10-5 (You may be a little informal in your proof)

\end{problems}

\end{document}

