(signal processing) A discrete window function, w(n)=1/2;(1- cos ((2𝜋n)/(N-1))), typically used to select a subset of a series of samples in order to perform a Fourier transform or other calculation.

(mathematics) Any of the elements of the Bloch space.

(mathematics) A function whose domain is a subset of its codomain, and for which all of the elements in its domain are fixed points.

(philosophy) A form of functionalism (philosophical paradigm of mind) based on the rejection of behaviorist theories in psychology and their replacement with empirical cognitive models of the mind.

(mathematical analysis, statistics) Any of various real functions whose graph resembles an elongated letter "S"; specifically, the logistic function y=(eˣ)/(eˣ+1)=1/(1+e⁻ˣ).

(number theory) A function, denoted by S(n) for some positive integer n, that yields the smallest number s such that n divides the factorial s!. For example, the number 8 does not divide 1!, 2!, 3!, but does divide 4!, so S(8) = 4.

(object-oriented programming) Entity made up of all methods having the same name.

(mathematics) The second of the polygamma functions, after the digamma function.

(mathematics) The first of the polygamma functions, being the logarithmic derivative of the gamma function.

(databases) A function that takes input from various rows at once.