The Polygamma Function is the logarithmic derivative of the gamma function. It has an order (${\displaystyle s}$) as well as an argument.

${\displaystyle \psi_{s}(x) = \frac{\Gamma^{(s)}(x)}{\Gamma(x)}}$

Where ${\displaystyle ^{(s)}}$ is the nth derivative of the gamma function.

This article is a stub. You can help Math Wiki by expanding it. v t e