- #1

- 43

- 0

concerning serie representation of psi function.

In te solution of bessel function of the second kind we have the following expressions for the psi functions

psi(m+1) and psi(n+m+1) then they give the series for the two psi functions ie(or digamma function)

sum

k from 1 to m of 1/k and ( for the first)

sum k from 1 to m+n of 1/k (for the second)

Is it possible to explain where this serie come from maybe using defintion of the psi function.I can't write latex sorry.

Tank you veru much