(mathematics) A function of two, three or n variables which is a solution to any of Laplace's equations

(mathematics) Any of a set of functions the value of which can not be deduced from that of all the others.

(mathematics) An entire function

(electronics) An electronic logic circuit which inverts the phase of a signal

(management) Any primary business function that would affect customers or profits if interrupted

(mathematics) Any function whose graph is a straight line: f(x)=ax+b

(mathematics) Any function that possesses a finite integral

(mathematics) A function which expresses numerically the loss produced by a decision or other event

(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) Any function whose value repeats after the regular addition of a period to its independent variable; i.e., a function ƒ such that, for some positive constant p, ƒ(x + p) = ƒ(x) for all x.