Polygamma function
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In mathematics, the polygamma function of order m is a meromorphic function on the complex numbers C defined as the th derivative of the logarithm of the gamma function:
Complex Log Gamma
Complex Polygamma 0
Complex Polygamma 1
Complex Polygamma 2
Gamma function
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In mathematics, the gamma function is the most common extension of the factorial function to complex numbers. First studied by Daniel Bernoulli, the gamma function Γ is defined for all complex numbers
Polygamma function
…the polygamma function of order m is a meromorphic function on the complex numbers C defined as the (m + 1)th derivative of the logarithm of the gamma function: Thus…
Daniel Bernoulli's letter to Christian Goldbach (Oct 6, 1729)