Look up function or functionality in Wiktionary, the free dictionary. Function or functionality may refer to: Function key, a type of key on computer keyboards...

mathematics, a function from a set X to a set Y assigns to each element of X exactly one element of Y. The set X is called the domain of the function and the...

A hash function is any function that can be used to map data of arbitrary size to fixed-size values, though there are some hash functions that support...

In linear algebra, a sublinear function (or functional as is more often used in functional analysis), also called a quasi-seminorm or a Banach functional...

function may refer to: Recursive function (programming), a function which references itself General recursive function, a computable partial function...

A logistic function or logistic curve is a common S-shaped curve (sigmoid curve) with the equation f ( x ) = L 1 + e − k ( x − x 0 ) {\displaystyle f(x)={\frac...

Bessel functions, named after Friedrich Bessel who was the first to systematically study them in 1824, are canonical solutions y(x) of Bessel's differential...

fields of group theory and representation theory of groups, a class function is a function on a group G that is constant on the conjugacy classes of G. In...

In complexity theory, a time-constructible function is a function f from natural numbers to natural numbers with the property that f(n) can be constructed...

The softmax function, also known as softargmax: 184  or normalized exponential function,: 198  converts a tuple of K real numbers into a probability distribution...

sigmoid function is any mathematical function whose graph has a characteristic S-shaped or sigmoid curve. A common example of a sigmoid function is the...

In computer programming, a pure function is a function that has the following properties: the function return values are identical for identical arguments...

A weight function is a mathematical device used when performing a sum, integral, or average to give some elements more "weight" or influence on the result...

The author function is the author as a function of discourse. The term was developed by Michel Foucault in his 1969 essay "What Is an Author?" where he...

analysis, a holomorphic function on an open subset of the complex plane is called univalent if it is injective. The function f : z ↦ 2 z + z 2 {\displaystyle...

ordinary differential equations (ODEs), Lyapunov functions, named after Aleksandr Lyapunov, are scalar functions that may be used to prove the stability of...

analytic function is a function that is locally given by a convergent power series. There exist both real analytic functions and complex analytic functions. Functions...

In vector calculus, an invex function is a differentiable function f {\displaystyle f} from R n {\displaystyle \mathbb {R} ^{n}} to R {\displaystyle \mathbb...

A likelihood function (often simply called the likelihood) measures how well a statistical model explains observed data by calculating the probability...

In propositional calculus, a propositional function or a predicate is a sentence expressed in a way that would assume the value of true or false, except...

The function point is a "unit of measurement" to express the amount of business functionality an information system (as a product) provides to a user....

a parity function is a Boolean function whose value is one if and only if the input vector has an odd number of ones. The parity function of two inputs...

mathematics, a real-valued function is called convex if the line segment between any two distinct points on the graph of the function lies above or on the graph...

In mathematics, the domain of a function is the set of inputs accepted by the function. It is sometimes denoted by dom ⁡ ( f ) {\displaystyle \operatorname...

computational complexity theory, a function problem is a computational problem where a single output (of a total function) is expected for every input, but...

In mathematics, a Gaussian function, often simply referred to as a Gaussian, is a function of the base form f ( x ) = exp ⁡ ( − x 2 ) {\displaystyle f(x)=\exp(-x^{2})}...

mathematical analysis, the Dirac delta function (or δ distribution), also known as the unit impulse, is a generalized function on the real numbers, whose value...

wave function are the Greek letters ψ and Ψ (lower-case and capital psi, respectively). Wave functions are complex-valued. For example, a wave function might...

anonymous function (function literal, expression or block) is a function definition that is not bound to an identifier. Anonymous functions are often...

Sexual function is how the body reacts in different stages of the sexual response cycle. It is defined as the ability of an individual to react sexually...