The gamma function is an extension of the concept of a factorial. For positive integers n, Gamma(n) = (n - 1)!The function is defined for all complex numbers z for which the real part of z is positive, and it is the integral, from 0 to infinity of [x^(z-1) * e^(-x) with respect to x.
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In basic mathematics, n factorial is equal to 1*2*3*...*n and is written as n! for positive integer values of n.The Gamma function is a generalisation of this concept, withGamma(x) = (x-1)! where x can be any real or complex.
It is impossible to answer this question without knowing what level of maths you are at. One answer, that is probably safe is, Γ(4) where Γ is the Gamma function.
An exclamation mark stands for factorial. For instance, if the number is 7!, then that would be 7x6x5x4x3x2x1. =================================================== Factorial means you multiply the integer written by every integer below it until you reach 1. Oddly enough, 0! = 1. There is also a 'factorial' function for non-integral values, called the Gamma function.
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