If you don’t know how to use Latex, take a look at the source code of the lectures that already exist as blog entries, by pressing “edit” below an entry name in the “All Posts” overview. You will then see the latex source code that produces the formulas in the blog.

The following information also might be helpful for you.

The “Short Math Guide for Latex” by the AMS: ftp://ftp.ams.org/pub/tex/doc/amsmath/short-math-guide.pdf

A short introduction to Latex (in German): lkurzauf2

A wiki-books chapter about writing maths in Latex: http://en.wikibooks.org/wiki/LaTeX/Mathematics