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For integers n 0, n factorial (written n!) is defined by

Who created the factorial?

The factorial notation of n! was first used by Christian Kramp in 1808 as a convenience to the printer. Kramp also did work on relating the factorial to non-integers; usually, the factorial is used only with non-negative integers. To learn more about how certain mathematical symbols were introduced into the field, check out Jeff Miller's webpage on the subject.

Interesting Factorial Facts

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