subfactorial (English, noun)
expansion: subfactorial (plural subfactorials)
Senses:
topics: combinatorics
mathematics
sciences
glosses: The result of deranging a number. In equations, it is usually symbolised by an exclamation mark (!) before the number being deranged (as opposed to factorials, where the exclamation mark occurs after the number).
Forms:
form: subfactorials
tags: plural