\documentclass[11pt]{article}
\include{header}
\begin{document}

%%\lecture{lecture-number}{date}{title}{scribe names}
\lecture{0}{01/20/05}{
Title}{Scriber}

\section{section1}

\begin{theorem}
 This is a theorem.
 \end{theorem}

\subsection{subsection}

\section{section2}
 \begin{theorem}
 This is a theorem.
 \end{theorem}





%\proof The proof is trivial. Take a look at previous definition.
%\QED

%\begin{proposition} Relationships among various classes are
%\[\p \subseteq \NP \subseteq \PSPACE \subseteq \EXP\]
%\end{proposition}

Here is a figure.
%\begin{figure}[ht]
%\begin{center}
%\includegraphics[height=2in,width=2in]{lecture0-figure1.eps}
%\end{center}
%\caption{An example of a decision tree}
%\label{lecture0:figure1}
%\end{figure}

\end{document}
