A point 
is said to be a periodic point of a function 
of period 
if 
, where 
and 
is defined recursively by 
.
Periodic Point
See also
Least Period, Periodic Function, Periodic SequenceExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Periodic Point." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/PeriodicPoint.html