Relation To Harmonic Numbers
The digamma function, often denoted also as ψ0(x), ψ0(x) or (after the shape of the archaic Greek letter Ϝ digamma), is related to the harmonic numbers in that
where Hn is the n harmonic number, and γ is the Euler-Mascheroni constant. For half-integer values, it may be expressed as
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