OVERHEADS IN LaTeX

You can paste the following lines to a LaTeX file and start producing OVERHEADS.
The command is slitex instead of latex
Here is a comparison of latex and slitex output of the example below.
Note that the formatting lines in the example are adjusted to our European needs. The set-up in slides.sty wastes paper and time.
\documentstyle{slides}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%               OVERHEADS IN LaTeX: file example.tex
%
%               slitex example.tex
%               ------
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\topmargin -.85in
\textheight 28cm
\textwidth 18cm
\oddsidemargin -.5in
\parskip 0.1cm
\parindent 0.0cm 
\def\mrule{\vskip 2mm \hrule \vskip 2mm}  
\begin{document}  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\mrule
\centerline{\bf EXAMPLE SLIDE }
\mrule
$$
i \ {\rm { d \over {d t} }} \
\left[
\begin{array}{c}
c_{1} \\
c_{2} \\
.     \\
c_{n}
\end{array}
\right]
\ = \ 
\left[
\begin{array}{cccc}
H_{11} & H_{12} & ...   & H_{1n} \\
H_{21} & H_{22} & ...   & H_{2n}  \\
...     &  ...   & ...   & ...   \\
H_{n1} & H_{n2} & ...   & H_{nn} 
\end{array}
\right]
\left[
\begin{array}{c}
c_{1} \\
c_{2} \\
.     \\
c_{n}
\end{array}
\right]  
$$
\end{document}