In mathematics, S-function may refer to:

• sigmoid function
• Schur polynomials
• A function in the Laplace transformed 's-domain'

In computer science,

• It may be member of a series of graph parameters, see Treewidth § Hadwiger number and S-functions

In physics, it may refer to:

• action functional

In MATLAB, it may refer to:

• A type of dynamically linked subroutine for Simulink.

This disambiguation page lists mathematics articles associated with the same title.
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