# List of periodic functions

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.

## Notes

- Formulae are given as Taylor series or derived from other entries.

- http://web.mit.edu/jorloff/www/18.03-esg/notes/fourier-tan.pdf
- Papula, Lothar (2009).
*Mathematische Formelsammlung: für Ingenieure und Naturwissenschaftler*. Vieweg+Teubner Verlag. ISBN 3834807575. - http://mathworld.wolfram.com/FourierSeries.html

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