exponential function

A function of the form f (x) = a^{x} where a is any positive constant except 1.
inverse function

The inverse, f^{1}(x), reverses the operations of f (x). If f^{1}(x) exists for a
certain function f, then f (f^{1}(x)) = x and f^{1}(f (x)) = x.
logarithmic differentiation

A method of finding the derivatives of functions that are raised to powers of the variable
x. The use of logarithms helps to convert powers into products, which are more
readily differentiated.
exponential growth

A type of growth in which the rate of change of the quantity is proportional to the
quantity itself. In other words,
= ky 

Functions with this property have a constant percentage increase per time interval, and
are of the form
With exponential growth,
k is greater than zero.
exponential decay

A type of decay in which the rate of change of the quantity is proportional to the quantity
itself. In other words,
= ky 

Functions with this property have a constant percentage decrease per time interval, and
are of the form
With exponential decay,
k is less than zero.