Factorial
The concept of fatorials also applies if n is not an integer. Usually you use the gamma function in the form
Г(n + 1) = n!
Explanation
For factorials of integers applies
n! = 1 × 2 × 3 × ... × n
and this gives
0! = 1
1! = 1
2! = 2
3! = 6
4! = 24
In a geometric image you can connect the points
You can approach this curve with the formula
Example 1
The factorial of the number e can be calculated as