the error function ("erf") is defined as $\displaystyle erf(x) = \frac{2}{\sqrt{\pi}}\int^{x}_{0} {e^{-u^2} du}$.

evaluate the definite integral $\displaystyle \int^{\alpha}_0 {erf (x) dx}$, where $\displaystyle \alpha$ is greater than $\displaystyle {0}$

note: does anyone know the LaTeX symbol for greater than? all i could find was greater than or equal to which is \geq