Written by WordPress.com supports Latex, a typesetting system that’s really good at formatting mathematical formulas.
To include Latex 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
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