Complex Gamma Function

For Gam(x) with x.i == 0, use the real Gam(x.r) function.

See: Real Gamma Function
For complex x, use the same method as the real function, but let the terms in the expansion take on complex values. The reflection formula is used if x.r < −5.

See: Gamma Function -- From MathWorld
And: Wolfram Function Evaluation -- Gamma
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