(mathematical analysis) A function whose codomain is a topological space and domain is a measurable space, with the property that the inverse image of every open set in its codomain is a measurable set in its domain.

(mathematics) A generalization of the indicator function for a fuzzy set which assigns a truth value (0 or 1) to each element.

(logic) An expression containing algebraic symbols that serve to represent words or other elements of a sentence or proposition

(mathematics) A function of a complex variable obtained by differentiating the logarithm of a gamma function; the digamma function / (physics) The Schrödinger wave function

(mathematics) a meromorphic function

(statistics) Any function used to obtain a set of samples from a given population

(mathematics) Any function whose domain is a vector space and whose value is its scalar field

(mathematics, logic) A Boolean function whose value is interpreted as truth or falsity

(management) Any secondary business activity that supports the line functions of a business, but does not directly affect customers or profits

(mathematical analysis) Any complex-valued measurable function whose range is finite.