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InnerDifferentiate​(AngouriMath.​Entity.​Variable)

 Method (no overloads)

Summary

(a!)' = a! psi(a + 1) a': x! is Gamma(x + 1), and the digamma function is
Gamma'/Gamma.

Remarks

It declined while the library had no digamma function, and before that answered
NaN, which says the derivative does not exist where it does
(https://github.com/asc-community/AngouriMath/issues/958): d/dx x! at 3 is
Gamma'(4) = 6 psi(4), about 7.5367.
https://github.com/asc-community/AngouriMath/issues/171

























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