This is a list of some well-known periodic functions.
The constant function f (x) = c, where c is independent of x, is periodic with any period, but lacks a fundamental period.
A definition is given for some of the following functions, though each function may have many equivalent definitions.
All trigonometric functions listed have period
K means Elliptic integral K(m) where
is the Heaviside step functiont is how long the pulse stays at 1 given
is its real-valued inverse.
is the Bessel Function of the first kind.