This help to calculate correlation functions and to find conservation laws.

The motion of the paper is indicated by the peak in the correlation function.

The peak in the correlation function indicates the motion of the paper.

The second quantity is known as the correlation function.

The correlation function can be shown with the equation 4.

If it is not, then more complicated correlation functions can be defined.

Such correlation functions also may be determined with other (equivalent) techniques.

Thus the correlation function between variables and is given by:

Then feed both tapes to the computer and check the correlation function.

This concept is important for working with correlation functions in quantum field theory.