Periodic Function
A Function 
is said to be periodic with period 
if 
for 
, 2, .... For example, theSine function 
is periodic with period 
(as well as with period 
, 
, 
, etc.).
The Constant Function 
is periodic with any period 
for all Nonzero Real Numbers , so there is no concept analogous to the Least Period or a Periodic Point for constant functions.
References
Morse, P. M. and Feshbach, H. Methods of Theoretical Physics, Part I. New York: McGraw-Hill, pp. 425-427, 1953. Spanier, J. and Oldham, K. B. ``Periodic Functions.'' Ch. 36 in An Atlas of Functions. Washington, DC: Hemisphere, pp. 343-349, 1987.
- Anticevian Triangle
- Antichain
- Anticlastic
- Anticommutative
- Anticommutator
- Anticomplementary Triangle
- Antiderivative
- Antidifferentiation
- Antigonal Points
- Antihomography
- Antihomologous Points
- Antilaplacian
- Antilinear Operator
- Antilogarithm
- Antimagic Graph
- Antimagic Square
- Antimorph
- Antimorphic Number
- Antinomy
- Antiparallel
- Antipedal Triangle
- Antipersistent Process
- Antipodal Map
- Antipodal Points
- Antipode