Sandbox

http://grass.osgeo.org like this

Quantum GIS like this like this ${\frac {1}{2}}$ like this http://geo.fsv.cvut.cz http://osgeo.org test $\operatorname {erfc} (x)={\frac {2}{\sqrt {\pi }}}\int _{x}^{\infty }e^{-t^{2}}\,dt={\frac {e^{-x^{2}}}{x{\sqrt {\pi }}}}\sum _{n=0}^{\infty }(-1)^{n}{\frac {(2n)!}{n!(2x)^{2n}}}$