\documentstyle[epsf]{slides}

\newcommand{\diff}[2]{\frac{\partial#1}{\partial #2}} 
\newcommand{\limit}[2]{\lim_{#1 \rightarrow #2}}
\newcommand{\limtoinf}[1]{\lim_{#1 \rightarrow \infty}}
\newcommand{\summii}{\sum_{m=1}^{\infty}} \input psfig

\begin{document} 
\blackandwhite{latex.tex} % tells LaTeX to use the
			  % slides in latex.tex
\end{document}