<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><sub>Reference: imported excerpt and wiki from the <a href="http://meta.math.stackexchange.com/tags/mathjax/info">Mathematics Stack Exchange Meta</a> site.</sub></p>
