Exponential growth - Wikipedia
https://en.wikipedia.org/wiki/Exponential_growthExponential growth is a process that increases quantity over time. It occurs when the instantaneous rate of change (that is, the derivative) of a quantity with respect to time is proportional to the quantity itself. Described as a function, a quantity undergoing exponential growth is an exponential functionof time, that is, the variable representing time is the exponent (in contrast to other types of …