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  2. What is a Function? - Math is Fun

    www.mathsisfun.com/sets/function

    A function relates an input to an output. It is like a machine that has an input and an output. And the output is related somehow to the input. Input, Relationship, Output. We will see many ways to think about functions, but there are always three main parts: The input. The relationship. The output.

  3. Function (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Function_(mathematics)

    In mathematics, a function from a set X to a set Y assigns to each element of X exactly one element of Y. [1] The set X is called the domain of the function [2] and the set Y is called the codomain of the function. [3] Functions were originally the idealization of how a varying quantity depends on another quantity.

  4. In simple words, a function is a relationship between inputs where each input is related to exactly one output. Every function has a domain and codomain or range. A function is generally denoted by f(x) where x is the input. The general representation of a function is y = f(x).

  5. Function | Definition, Types, Examples, & Facts | Britannica

    www.britannica.com/science/function-mathematics

    function, in mathematics, an expression, rule, or law that defines a relationship between one variable (the independent variable) and another variable (the dependent variable). Functions are ubiquitous in mathematics and are essential for formulating physical relationships in the sciences.

  6. Section 3.4 : The Definition of a Function - Pauls Online Math...

    tutorial.math.lamar.edu/Classes/Alg/FunctionDefn.aspx

    Definition of a Function. A function is a relation for which each value from the set the first components of the ordered pairs is associated with exactly one value from the set of second components of the ordered pair. Okay, that is a mouth full. Let’s see if we can figure out just what it means.

  7. What is a function? (video) | Functions - Khan Academy

    www.khanacademy.org/math/algebra/x2f8bb11595b61c86:functions/x2f8bb11595b61c86:...

    Functions assign a single output for each of their inputs. In this video, we see examples of various kinds of functions.

  8. 2.1: Introduction to Functions - Mathematics LibreTexts

    math.libretexts.org/Bookshelves/Algebra/Intermediate_Algebra_(Arnold)/02...

    Definition. If a function is defined by an equation, then the domain of the function is the set of “permissible x-values,” the values that produce a real number response defined by the equation.

  9. Functions - Khan Academy

    www.khanacademy.org/math/algebra/x2f8bb11595b61c86:functions

    A function is like a machine that takes an input and gives an output. Let's explore how we can graph, analyze, and create different types of functions. **Unit guides are here!**

  10. Function Definition (Illustrated Mathematics Dictionary) - Math...

    www.mathsisfun.com/definitions/function.html

    What is a Function. Illustrated definition of Function: A special relationship where each input has a single output. It is often written as f (x) where x is the input...

  11. A function is a relation between two sets where each element of the first set (called the domain) is related to only one element of the second set (called the range). A function can be in various forms, such as a formula, a graph, or a table, and often, variables are represented by x and y.