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

(mathematics) An inverse hyperbolic function

The inverse of a hyperbolic function

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

(mathematics) Any function of a real variable whose value decreases as the variable increases.

(psychology) The management of mental processes by the ego in order to meet an individual's needs

The transfer function of the forward path of a control system

The transfer function of the feedback path of a control system

(computing) A program, module or subroutine etc that returns the value of a defined function

(physics) An approximation to a wave function made by taking a linear combination of simpler functions