Math We support MimeTeX formatting as well, for people who want to write mathematical expressions. If you post this: $$x=\frac{-b\pm\sqrt{b^2-4ac}}{2a}$$ It will render like this: $x=\frac{-b\pm\sqrt{b^2-4ac}}{2a}$ For more information on syntax, see http://www.forkosh.com/mimetex.html.