Formula:2868

Digital Library of Mathematical Functions ID 5.15.E1

${\displaystyle{\displaystyle\psi'\left(z\right)=\sum_{k=0}^{\infty}\frac{1}{(k+z)^{2}},}}$

Constraint(s)

${\displaystyle{\displaystyle z\neq 0,-1,-2,\dots}}$

Symbols List

• ${\displaystyle{\displaystyle\psi\left(\NVar{z}\right)}}$: psi (or digamma) function
• ${\displaystyle{\displaystyle k}}$: nonnegative integer
• ${\displaystyle{\displaystyle z}}$: complex variable
 

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