Would you like to lend a helping hand, or just get more involved?
The Today's articles for improvement (TAFI) project is a great way to contribute. This project identifies and collaborates upon underdeveloped articles that require improvement.
There are no requirements for membership (other than the fact that you must be extra nice to newcomers) and it is wikifun!
When using math in an article, there are two different types of markup that one can use. It is important to be consistent throughout an article and use the same type of markup. If a formula appears all on the same line, it would be better to use HTML than LaTeX, because L∞ looks better in line than does; however it's generally a bad idea to attempt to render in HTML.