Factorial, DoubleFactorial, Binomial, RisingFactorial, FallingFactorial
Synopsis
#include <flint/fexpr_builtin.h>FactorialDoubleFactorialBinomialRisingFactorialFallingFactorialFactorial(n) (n!), DoubleFactorial(n) (n!!), the binomial coefficient Binomial(n, k) ({n \choose k}), and the rising and falling factorials RisingFactorial(z, k) (\left(z\right)_{k}) and FallingFactorial(z, k) (\left(z\right)^{\underline{k}}).
Cite this page
The FLINT team, “Factorial, DoubleFactorial, Binomial, RisingFactorial, FallingFactorial (fexpr_builtin.h),” FLINT: Fast Library for Number Theory, documentation, version 3.7.0-dev, 2026. https://flintlib.org/doc/fexpr_builtin/Factorial.html (generated 2026-10-20).
@misc{flint-doc-fexpr-builtin-Factorial,
author = {{The FLINT team}},
title = {{Factorial, DoubleFactorial, Binomial, RisingFactorial, FallingFactorial (fexpr\_builtin.h)}},
howpublished = {FLINT: Fast Library for Number Theory, documentation, version 3.7.0-dev},
year = {2026},
url = {https://flintlib.org/doc/fexpr_builtin/Factorial.html},
note = {Generated 2026-10-20}
}