DigammaFunction

$$\psi\!\left(z\right)$$

Digamma function.

$$\psi'\!\left(z\right)$$

Differentiated digamma function (trigamma function).

$$\psi^{(n)}\!\left(z\right)$$

Polygamma function ($n$-times differentiated digamma function).

Last updated: 2020-03-06 00:22:16