MathJax is now enabled for this site.  For example, here are the Lorenz's equations:

\begin{aligned} \dot{x} & = \sigma(y-x) \\ \dot{y} & = \rho x - y - xz \\ \dot{z} & = -\beta z + xy \end{aligned}

which is created by

\begin{aligned}\dot{x} & = \sigma(y-x)\\\dot{y} & = \rho x - y - xz\\\dot{z} & = -\beta z + xy\end{aligned}

To setup MathJaX with Joomla! is easy.

Just add the following lines before the </head> tag in the file index.php in the template directory; save & close, and you have it.

  <SCRIPT SRC="http://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML">     MathJax.Hub.Config({
extensions: ["tex2jax.js","TeX/AMSmath.js","TeX/AMSsymbols.js"],
jax: ["input/TeX","output/HTML-CSS"],
tex2jax: {inlineMath: [["$","$"],["\$","\$"]]},
processEscapes: true
});
</SCRIPT>

There are also commercial plug-ins available for Joomla!