\documentclass[12pt]{article}% there are lots of classes -- this is the easiest for us
\usepackage{amssymb}%  this allows us to use certain symbols from the Amer. Math. Soc.
%this is the end of the "top matter"  You could put user-defined definitions up here
\usepackage[all]{xy} %array package
\usepackage{amsmath}%uses \overset to set equations
\usepackage{graphicx}
\usepackage{amscd}
\usepackage{geometry}%
\usepackage{amsfonts}%
\usepackage{amsthm}
\usepackage{bm}
% Start by defining the theorem environments.

% The default theorem style is plain.
\newtheorem{defaultThm}{Theorem}[section]

\begin{document}                %every document needs this command
\title{My Comments}             % Enter your title between curly braces
\author{ Fred Tinsley}          % Enter your name between curly braces
\date{\today}                   % Enter your date or \today between curly braces
\maketitle                      %This will gives our document a title, using the above info
\section{Introduction}          %Latex numbers the sections


%~\cite{lyndon:tex}

%\nocite{*}
%\bibliography{tins_4}

%\bibliographystyle{abbrv}

\end{document} %all documents end here!
