! In mathematics, it is a factorial symbol. The factorial of a positive integer is the product of all positive integers less than or equal to this number, and the factorial of 0 is 1.

Which is n! =1× 2× 3× ...× n. The factor can also be defined recursively: 0! = 1，n！ =(n- 1)！ ×n .

Factorial factor can also be defined in integer real numbers (except negative integers), and its relationship with gamma function is:

n！ Qualitative factors can be decomposed into, for example, 6! =24×32×5 1。

Extended data

Factorial function:

The factorial of a positive integer 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! . In 1808, Keyston Kaman introduced this symbol.

Which is n! =1× 2× 3× ...× n. The factor can also be defined recursively: 0! = 1，n！ =(n- 1)！ ×n .

Factorial factor can also be defined in integer real numbers (except negative integers), and its relationship with gamma function is:

n！ Qualitative factors are decomposed into

, such as 6! =2×3×5。 ?

Baidu encyclopedia-factorial symbol

Baidu encyclopedia-factorial function