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RisingFactorialf

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Description

Summary

The rising factorial risingfactorial(x, n), x to the n rising: x (x + 1) ... (x + n - 1) for a whole n >= 0, in the notation x^{\overline{n}} of Graham, Knuth and Patashnik's Concrete Mathematics.

Remarks

For a negative whole n it is 1 / ((x - 1) (x - 2) ... (x + n)), and for any other n it is Γ(x + n) / Γ(x), as Mathematica's Pochhammer is. The name pochhammer is refused, since the Pochhammer symbol is the falling factorial to some authors.
https://github.com/asc-community/AngouriMath/issues/2182

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