e-folding - In science, e-folding is the time interval in which an exponentially growing quantity increases by a factor of e; it is the base-e analog of doubling time.

Half-life - Half-life is the time required for a quantity to reduce to half its initial value. The term is commonly used in nuclear physics to describe how quickly unstable atoms undergo, or how long stable atoms survive, radioactive decay.

Rule of 72 - In finance, the rule of 72, the rule of 70 and the rule of 69.3 are methods for estimating an investment's doubling time. The rule number is divided by the interest percentage per period to obtain the approximate number of periods required for doubling.

Albert Allen Bartlett - Albert Allen Bartlett was an emeritus professor of physics at the University of Colorado at Boulder, USA. Professor Bartlett had lectured over 1,742 times since September, 1969 on Arithmetic, Population, and Energy.

Exponential decay - A quantity is subject to exponential decay if it decreases at a rate proportional to its current value. Symbolically, this process can be expressed by the following differential equation, where N is the quantity and λ is a positive rate called the exponential decay constant...