Digamma Function

In mathematics, the digamma function is defined as the logarithmic derivative of the gamma function:

It is the first of the polygamma functions.

Read more about Digamma Function:  Relation To Harmonic Numbers, Integral Representations, Series Formula, Taylor Series, Newton Series, Reflection Formula, Recurrence Formula and Characterization, Gaussian Sum, Gauss's Digamma Theorem, Computation and Approximation, Special Values

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