What is the Gaussian Quadrature?

[S = k log w]

I am not sure of the spelling, but I heard of the 'gaussian quadature' (or quadrature). It was spoken, and was in a mathematical equation.

What the heck is it?

 

[Ambitwistor]

Google is your friend:

http://mathworld.wolfram.com/GaussianQuadrature.html