Formula:2875

Digital Library of Mathematical Functions ID 5.15.E8

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

Symbols List

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

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