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What is "psi function"

Wiktionary
psi function

n. 1 (context mathematics English) A function of a complex variable obtained by differentiating the logarithm of a gamma function; the digamma function 2 (context physics English) The Schrödinger wave function

Wikipedia
Psi function

Psi function can refer, in mathematics, to

  • the ordinal collapsing function ψ(α)
  • the Dedekind psi function ψ(n)
  • the Chebyshev function ψ(x)
  • the polygamma function ψ(z) or its special cases
    • the digamma function ψ(z)
    • the trigamma function ψ(z)

and in physics to

Usage examples of "psi function".

But I suspect they'd have to depress your psi function to the point where I couldn't operate on it.

She was willing to give up the psi function of the channels entirely, for you.

I'll hazard a guess that the psi function even instigates mutations, some of the deadlier types are just too one-sided to have come about naturally in a brief three hundred years.

I'll hazard a guess that the psi function even instigates mutations, some of the deadlier types are just too one‑.