double factorial
For an odd integer, the result of multiplying all the odd integers from 1 to the given…For an odd integer, the result of multiplying all the odd integers from 1 to the given number; or for an even integer, the result of multiplying all the even integers from 2 to the given number; symbolised by a double exclamation mark (!!). For example, 9!! = 1 × 3 × 5 × 7 × 9 = 945.
Meaning
1 sensesFor an odd integer, the result of multiplying all the odd integers from 1 to the given number; or for an even integer, the result of multiplying all the even integers from 2 to the given number; symbolised by a double exclamation mark (!!). For example, 9!! = 1 × 3 × 5 × 7 × 9 = 945.
Doppelfakultät, doppelte Fakultät
Translations
4 languagesBy meaning 1
Origin
From double + factorial.From double + factorial.
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Forms
plural: double factorials| Singular | double factorial |
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| Plural | double factorials |
regular