(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).

plural of Walsh function

plural of functional water

Bottled water with added vitamins, minerals, etc., sold as a health drink.

plural of bent function

(mathematics) In harmonic analysis, any of a complete orthogonal set of functions that can be used to represent any discrete function.

(combinatorics) A Boolean function f: Z ₂ⁿ→ Z ₂ whose Walsh transform has constant absolute value.

(combinatorics) A function from the natural numbers to the set {−1, 0, 1} which maps perfect squares to 0, prime numbers to −1, and is multiplicative.

plural of divisor function

plural of forcing function