Talk:Digamma function

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A lead would help. Geometry guy 15:07, 10 June 2007 (UTC)

[edit] Silly Question

Does anyone know why a function named after one Greek letter is usually denoted by a different greek letter? Why say $\digamma$ but write $ψ$ ? 130.94.162.64 08:43, 25 November 2005 (UTC)

Huh? Ohh. Seems that wiki-TeX is rendering \digamma as a captial F instead of \psi with a prime on it. Strange. I will ask at Wikipedia talk:WikiProject Mathematics. linas 16:22, 25 November 2005 (UTC)

Oh, right. Yes, I have seen this as an alternate notation for the digamma. Its rare, I think, but not so rare that TeX didn't decide to create a special symbol for it. As you know, in math, there just aren't enough symbols. linas 17:01, 25 November 2005 (UTC)

[edit] Rapidly convergent series needed

I need a a series expression for the digamma that is rapidly convergent, so that it can be used for high-precision numeric calculations. This article lacks such a beast...

Maybe the Borwein Tchebeysheff-polynomial trick for the rapid calculation of the Riemann zeta can be extended to the Hurwitz zeta. Then the digamma can be obtained from there ... anyone have a reference for this? linas 20:12, 22 April 2006 (UTC)