Factorial

From specialfunctionswiki
Revision as of 19:40, 9 October 2016 by Tom (talk | contribs)
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to: navigation, search

Let $n$ be an integer. Then the factorial of $n$, written $n!$, is the integer $$n!=\displaystyle\prod_{k=1}^n k=n(n-1)(n-2)\ldots 3 \cdot 2 \cdot 1.$$

Properties

0!=1

See Also

Gamma function