<p><a href="http://en.wikipedia.org/wiki/MathJax" rel="nofollow">MathJax</a> is used to write mathematical expressions on this site. Its syntax is essentially the same as LaTeX.</p>

<p>MathJax help currently points to an <a href="http://www.math.harvard.edu/texman/" rel="nofollow">introduction on the Harvard web pages.</a>  Additional help is available on the <a href="http://tex.stackexchange.com/">SE TeX site</a>.</p>
