The inverse of a hyperbolic function

(mathematics) An inverse hyperbolic function

(mathematics) A function that is the inverse of an appropriate restriction of a trigonometric function.

(systems theory) That part of a control system that dynamically updates the parameters of an optimizing control function or a direct control function

(mathematics, physics) A function which specifies the average density of atoms, molecules etc in three dimensions from a given point.

(computing) A function key whose function can be assigned by the user or by a program.

(computing) Any of a set of subroutines supplied with a language or system that can be called to perform standard mathematical functions efficiently

(medicine) Any of several diagnostic procedures that test the blood clotting function of platelets

(medicine) A form of magnetic resonance imaging that records the flow of blood to areas of the brain when the patient is undertaking a specific neural activity.