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Gamma function

In mathematics, the Gamma function (represented by the capital Greek letter Γ) is an extension of the factorial function to realcomplex numbers. For a complex number z with positive real part the Gamma function is defined by and

This definition can be extended by analytic continuation to the rest of the complex plane, except the non-positive integers.

If n is a positive integer, then

Γ(n) = (n − 1)!

showing the connection to the factorial function. Thus, the Gamma function extends the factorial function to the real and complex values of n.

Beta function

In mathematics, the beta function, also called the Euler integral of the first kind, is a special function defined by

Properties

The beta function is symmetric, meaning that

It has many other forms, including:

Wallis Formula

The Wallis formula follows from the infinite product representation of the sine

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