Changes

*Gamma function is defined for all complex numbers except the non-positive integers.  

*Gamma function is defined for all complex numbers except the non-positive integers.  

*For complex numbers with a positive real part, it is defined via a convergent improper integral:

*For complex numbers with a positive real part, it is defined via a convergent improper integral:

<math>\Gamma (z) = \int\limits_{0}^{/infty} x^{z-1} e^{-x} dx </math>

<math>\Gamma (z) = \int\limits_{0}^{infty} x^{z-1} e^{-x} dx </math>