WordPress.com supports , a typesetting system that’s really good at formatting mathematical formulas.
To include code in your post, use the following:
$latex your-latex-code-here$
So, for example,
$latex i\hbar\frac{\partial}{\partial t}\left|\Psi(t)\right>=H\left|\Psi(t)\right>$
produces
These few standards show a bit more about what’s now possible on WordPress.com.