Relation to the Logarithmic Function

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\int_{x}^{x+1}\frac{\Gamma'(s)}{\Gamma(s)}ds=\log x

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\int_{1}^{n+1}\frac{\Gamma'(s)}{\Gamma(s)}ds=\log(n!)

This Relation between the Gamma Function and the classic Logarithmic Function is simple yet fascinating.

It makes use of the concept of Logarithmic Derivative, which is very common in Complex Analysis.

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