pe·ri·od·ic func·tion
/ˌpirēädik ˈfəNGkSH(ə)n/
noun
a function returning to the same value at regular intervals.
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Periodic function
A periodic function or cyclic function, also called a periodic waveform, is a function that repeats its values at regular intervals or periods. The repeatable part of the function or waveform is called a cycle. For example, the trigonometric... Wikipedia
A periodic function or cyclic function, also called a periodic waveform (or simply periodic wave), is a function that repeats its values at regular intervals ...
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, ...