Exponential function

The exponential function is the function $f(x) = e^x$ , exponentiation by e. It is a very important function in analysis, both real and complex.

Exponential functions are functions that grows or decays at a constant percent rate. Exponential functions that result in an increase of y is called an exponential growth. Exponential functions that result in an decrease of y is called an exponential decay.

Exponential functions are in one of three forms. $f\left( x \right) = ab^x$ , $f\left( x \right) = ae^k$ , where e is the irrational constant 2.71828182846...., or $f\left( x \right) = a\left( {{1 \over 2}} \right)^{{x \over h}}$ $f\left( x \right) = a\left( 2 \right)^{{x \over d}}$ , where h is the half-life (for decay), or d is the doubling time (for growth).

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Exponential function