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  1. What is a Function? - Math is Fun

    What is a 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. " f (x) = ... " is the classic way …

  2. Function (mathematics) - Wikipedia

    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 …

  3. FUNCTION Definition & Meaning - Merriam-Webster

    The meaning of FUNCTION is professional or official position : occupation. How to use function in a sentence. Synonym Discussion of Function.

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

    Jun 14, 2024 · 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 …

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

    May 14, 2025 · Function, in mathematics, an expression, rule, or law that defines a relationship between one variable (the independent variable) and another variable (the dependent …

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