! (factorial)
The factorial operator.
Syntax
-
n!-
nis a non-negative integer
-
Description
For a non-negative integer n, n! is the product of the n smallest positive integers:
n! = ∏(k, k, 1, n).
Notes
The postfix operator ! is mapped to the factorial function.
Examples
5!
120
∑(1/k!, k, 0, 100)
2.71828182846 (=e)
SequenceVector(10) @ factorial
(1, 2, 6, 24, 120, 720, 5040, 40320, 362880, 3628800)