Digamma Function

In mathematics, the digamma function is defined by
\psi(x) =D \ln{\Gamma(x)}= \frac{\Gamma'(x)}{\Gamma(x)}
where D is the differential operator. The digamma function, often denoted also ψ0(x) or even ψ0(x), is related to the harmonic numbers in that
\psi(n) = H_{n-1}-\gamma
where Hn−1 is the (n−1)th harmonic number, and γ is the well-known Euler-Mascheroni constant.

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