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

(mathematics) The function whose value is zero if its independent variable is negative, and one otherwise.

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

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

(physics) A function of the position and spin of an electron; related to the probability of finding the electron in a specified position

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

The ratio of the Laplace transform of the primary feedback signal of a control system to that of the actuating signal

(astronomy) a relationship that specifies the mass distribution of a newly formed stellar population

(mathematics) The logarithm of a trigonometric function

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