Digamma function
In
mathematics, the
digamma function is defined by
-
where
D is the
differential operator.
The digamma function, often notated also ψ0(x) or even ψ0(x), is related to the harmonic numbers in that
-
where
Hn-1 is the (
n-1)'th harmonic number, and γ is the well-known
Euler-Mascheroni constant.
Also see