Difference between revisions of "Factorial"
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Let $n$ be an integer. Then the factorial of $n$, written $n!$, is the integer | Let $n$ be an integer. Then the factorial of $n$, written $n!$, is the integer | ||
$$n!=\displaystyle\prod_{k=1}^n k=n(n-1)(n-2)\ldots 3 \cdot 2 \cdot 1.$$ | $$n!=\displaystyle\prod_{k=1}^n k=n(n-1)(n-2)\ldots 3 \cdot 2 \cdot 1.$$ | ||
| + | |||
| + | =Properties= | ||
| + | [[0!=1]]<br /> | ||
=See Also= | =See Also= | ||
Latest revision as of 19:40, 9 October 2016
Let $n$ be an integer. Then the factorial of $n$, written $n!$, is the integer $$n!=\displaystyle\prod_{k=1}^n k=n(n-1)(n-2)\ldots 3 \cdot 2 \cdot 1.$$
