Mathmode.pdf      : math in TeX/LaTeX; package amsmath.sty
                    needs package showexpl.
Mathmode.ltx	  : main source file (preamble)
Mathmode.tex	  : document source
Mathmode.bib	  : BibTeX data
Mathmode.ist	  : index style file
showexpl.cfg      : config file for the showexpl package
                    save it together with showexpl.sty
images/           : subdir for all pdf|eps images