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Digamma function

The digamma function is the logarithmic derivative

ψ (z) = \frac{Γ ^{'} ( z )}{Γ ( z )} .

Logarithmically differentiating the Weierstrass product gives

ψ (z) = - γ - \frac{1}{z} + z \sum_{k = 1}^{\infty} \frac{1}{k ( z + k )} .

Table of contents 56 2
- Trigamma function Digamma function 11
- Positive zero of the digamma function Digamma function 29

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