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In mathematics, by '''sigma function''' one can mean one of the following:

* The [[Divisor function|sum-of-divisors function]] σ<sub>''a''</sub>(''n''), an arithmetic function
* [[Weierstrass sigma function]], related to elliptic functions
* Rado's sigma function, see [[busy beaver]]

See also [[sigmoid function]].

{{mathdab}}

Sigma function - Revision history

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