# Tau function

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'''Tau function''' may refer to:

* [Tau function (integrable systems)](/source/Tau_function_(integrable_systems)), in integrable systems
* [Ramanujan tau function](/source/Ramanujan_tau_function), giving the Fourier coefficients of the Ramanujan modular form
* [Divisor function](/source/Divisor_function), an arithmetic function giving the number of divisors of an integer

{{disambiguation}}

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Adapted from the Wikipedia article [Tau function](https://en.wikipedia.org/wiki/Tau_function) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Tau_function?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.