---
tag: 0ATF6Q0633
kind: concept
name: Periodic function
msc: [26A09]
sources:
  - url: https://en.wikipedia.org/wiki/Periodic_function
    locator: lead section
same_as:
  wikidata: Q184743
  wikipedia: Periodic function
---

## Summary

A periodic function takes the same values again after each shift of the argument by a fixed nonzero number $T$. The sine and cosine functions are periodic with period $2 \pi$. The node [[periodic function|089KWVYD69]] gives the precise definition.