270 bytes added,
07:33, 10 October 2013 == Test page ==
This relates to the wiki page [http://www.mediawiki.org/wiki/Manual:Math]
<math>
\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}}
</math>