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Fungrim entry: 4f20ff

n!=n(n1)!n ! = n \left(n - 1\right)!
Assumptions:nZ1n \in \mathbb{Z}_{\ge 1}
TeX:
n ! = n \left(n - 1\right)!

n \in \mathbb{Z}_{\ge 1}
Definitions:
Fungrim symbol Notation Short description
Factorialn!n ! Factorial
ZZGreaterEqualZn\mathbb{Z}_{\ge n} Integers greater than or equal to n
Source code for this entry:
Entry(ID("4f20ff"),
    Formula(Equal(Factorial(n), Mul(n, Factorial(Sub(n, 1))))),
    Variables(n),
    Assumptions(Element(n, ZZGreaterEqual(1))))

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Copyright (C) Fredrik Johansson and contributors. Fungrim is provided under the MIT license. The source code is on GitHub.

2019-10-05 13:11:19.856591 UTC