(mathematics) Any function whose value is the solution of a quadratic polynomial

(mathematics) Any function, of multiple variables, whose value is independent of the order of the variables, i.e. f(a,b) = f(b,a).

(mathematics, computing) A function whose value is chosen at random from its domain / (mathematics) A function chosen at random from a set of functions

(physics) The minimum energy needed to remove an electron from the surface of a material

(computing) Any function that uses recursion and can call itself until a certain condition is met

(mathematics, complex analysis, algebraic geometry) Any function expressible as the quotient of two (coprime) polynomials (and which thus has poles at a finite, discrete set of points which are the roots of the denominator).

(physics) A function which describes the intensity of scattered radiation in any given direction

(computing) A function used in an operating system that is not available to application programs.

(mathematics) Any function whose range is n-dimensional

(algebra, logic, computing) Any function based on the operations AND, OR and NOT, and whose elements are from the domain of Boolean algebra