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 of writing a …
Function | Definition, Types, Examples, & Facts | Britannica
Dec 1, 2025 · 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 …
Function (mathematics) - Wikipedia
Functions are widely used in science, engineering, and in most fields of mathematics. It has been said that functions are "the central objects of investigation" in most fields of mathematics. [5]
What Are Functions in Math?- Cuemath
Functions define the relationship between two variables, one is dependent and the other is independent. Function in math is a relation f from a set A (the domain of the function) to another set B (the co …
Function in Maths - GeeksforGeeks
Dec 15, 2025 · Functions are fundamental in fields like algebra and calculus. They help model relationships and solve real-world problems. Here is how we represent the function, f (x) = y [Here, f …
Algebra - The Definition of a Function - Pauls Online Math Notes
Jun 14, 2024 · In this section we will formally define relations and functions. We also give a “working definition” of a function to help understand just what a function is. We introduce function notation and …
3.1 What Are Functions? - MIT Mathematics
The simplest definition is: a function is a bunch of ordered pairs of things (in our case the things will be numbers, but they can be otherwise), with the property that the first members of the pairs are all …
What is a Function - Math Steps, Examples & Questions
Understand that a function is a rule that assigns to each input exactly one output. The graph of a function is the set of ordered pairs consisting of an input and the corresponding output. Graph …
What is a Function in Maths? | Definition, Types & Examples
What Is a Function in Maths? A function in maths is a special rule or relationship that assigns each input (usually called x) exactly one output (usually called y or f (x)). In other words, for every value you put …
What is a Function in Maths? - BYJU'S
What is a Function in Maths? A function in maths is a special relationship among the inputs (i.e. the domain) and their outputs (known as the codomain) where each input has exactly one output, and …