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Gamma Gamma Hey!

One of the frustrating things about mathematics is that there are many important and popular functions that are easy to formulate but are extremely difficult to evaluate. We've already come across just such a function in the normal CDF, Φ, for which we were forced to resort to an arcane numerical approximation, filled to the brim with magic numbers. In this post, we shall take a look at a whole family of such functions; the gamma function and its relatives.

So without further ado; hey ho, let's go!

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