Exponentially Weighted Moving Average or Exponential Weighted Average is a very important concept to understand Optimization ...

This is an example of an exponential graph in the form y = k x. Graphs in the form of y = k x increase in value.

Stephen R. Wassell, Superexponentiation and Fixed Points of Exponential and Logarithmic Functions, Mathematics Magazine, Vol. 73, No. 2 (Apr., 2000), pp. 111-119 ...