Update math-basis.tex

To see this as an html file add this to the head:
"<style type="text/css">
header { border-bottom: 1px solid #000; height:45px;}
header > H4 { display: inline-block; }
header span { margin-right: 100px; display: inline-block;}
</style>"
put the text in the body enclosed in tags"<script type="math/tex; mode=display"> </script>"