subfactorial

nounC1

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Danh từ

noun

Plural noun:

subfactorials

1.
(mathematics, combinatorics) 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).

Nguồn gốc từ

From sub- + factorial.