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Task/Gamma-function/00DESCRIPTION

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+Implement one algorithm (or more) to compute the [[wp:Gamma function|Gamma]] (<math>\Gamma</math>) function (in the real field only). If your language has the function as builtin or you know a library which has it, compare your implementation's results with the results of the builtin/library function.
+The Gamma function can be defined as:
+
+:<math>\Gamma(x) = \displaystyle\int_0^\infty t^{x-1}e^{-t} dt</math>
+
+This suggests a straightforward (but inefficient) way of computing the <math>\Gamma</math> through numerical integration.
+Better suggested methods:
+* [[wp:Lanczos approximation|Lanczos approximation]]
+* [[wp:Stirling's approximation|Stirling's approximation]]