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positive integer
[positive integer|positive integer] A factorial is the product of a positive integer and all positive integers below it.
Definition
positive integer A factorial is the product of a positive integer and all positive integers below it. It is defined for positive integers where n is a positive integer and a n , … , a 0 are real numbers with a n ≠ 0.
Mechanism
positive integer A sequence is a function whose domain is the set of positive integers. The natural numbers are a subset of the integers.
Comparison
positive integer The principal n th root of a is written as a n , where n is a positive integer greater than or equal to 2. This notation differs from standard root notation by explicitly indicating the root degree.