Double factorial
Summary
In mathematics, the double factorial, or semifactorial, n\text{‼} of a positive integer is the product of all the positive integers up to that have the same parity (odd or even) as . That is,
Further reading
- Wikipedia, page 507208, revision 1350553238, Double factorial. adopted
About this page
| Tag | TER6MWXBS8 |
|---|---|
| URI | m2://TER6MWXBS8 |
| Aliases | double-factorials, n, odd-factorial, semifactorial |
| Kind | concept |
| Writing | W1 stated |
| Same as | |
| Changed | 4 November 2026 |
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- edge instance_of in: at least two examples (0 of 2)
- edge not_instance_of in: at least one non-example (0 of 1)
- edge specializes both: the more general notions and the special cases (0 of 1)
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