by Ricardo Fernández Serrata
Contains the standard and multi factorial functions with support for Real and/or negative numbers.
Float output doesn't match the Gamma function but it's quite close.
Stirling's Approximation (Constant-Time Factorial for Floats):
sqrt(2*Pi * x) * pow(x / exp(1), x)
Future: Inverse functions of everything here. Also the rising and falling facts.
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