Testing MathJax support

I have recently decided to add MathJax support using the techniques described at Dysfunctional. Unfortunately, math does not seem to be working in preview mode, and so I wrote this test post to see if formulas render when actually published. $H\left\vert\psi\right\rangle = E\left\vert\psi\right\rangle$. $x^2$ $\sqrt{x}$ $|x^2| = x^* x$