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impulse function
(mathematics) Any generalized function which is defined by its behavior under integration.
increasing function
(mathematics) Any function of a real variable whose value increases (or is constant) as the variable increases.
luminosity function
(astronomy) A relative measure of the relationship between stellar magnitude and the distribution of stars between magnitudes
natural function
(mathematics) An ordinary trigonometric function
analytic function
(mathematical analysis) Any smooth (infinitely differentiable) function f, defined on an open set D⊆ℂ( textit or⊆ℝ), whose value in some neighbourhood of any given point x_0∈D is given by the Taylor series ∑ₙ₌₀ ᪲(f⁽ⁿ⁾(x_0))/(n!)(x-x_0)ⁿ.
hypergeometric function
(mathematics) Any function that is a solution of the hypergeometric equation; usually an expansion of an hypergeometric series
identity function
(mathematics) A function whose value is always the same as its independent variable, and for which the codomain equals the domain.
function table
(mathematics) A printed tabulation of selected values of a function corresponding to selected independent variables; e.g. a table of logarithms.
inverse function
(mathematics) For a given function f, another function, denoted f⁻¹, that reverses the mapping action of f; (formally) given a function f:X→Y, a function g:Y→X such that, ∀x∈X,f(x)=y⟹g(y)=x.
