Use tags <nowiki><mathm></nowiki> for [http://en.wikipedia.org/wiki/LaTeX LaTeX formulae], eg, (click edit to see the source): <mathm>\operatorname{erfc}(x) = \frac{2}{\sqrt{\pi}} \int_x^{\infty} e^{-t^2}\,dt = \frac{e^{-x^2}}{x\sqrt{\pi}}\sum_{n=0}^\infty (-1)^n \frac{(2n)!}{n!(2x)^{2n}}</mathm>