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What does factorial mean?
The factorial is the product of all positive integers less than or equal to this number, and the factorial of 0 is 1. The factorial writing of natural number n! .

Calculation method:

Greater than or equal to 1

The factorial representation of any natural number with n greater than or equal to 1: or

Factorial of 0 0! = 1。

Extended data:

Definition scope of factorial:

Usually, the factorial we are talking about is defined in the range of natural numbers (most scientific calculators can only calculate the factorial of 0 ~ 69), and decimal scientific calculators have no factorial function, such as 0.5! ,0.65! ,0.777! It's all wrong

But sometimes we define the Gamma function as the factorial of non-integers, because when x is a positive integer n, the value of the Gamma function is the factorial of n- 1

Gamma function (gamma function)

Define gamma function:?

Using the knowledge of integral, we can prove that γ (s) = (s) × γ (s- 1).

So, when x is an integer n,? In this way, the gamma function is actually a continuation of factorial.

References:

Baidu encyclopedia-factorial