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.

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).

Oct 6, 2025 · A function is a special relation or method connecting each member of set A to a unique member of set B via a defined relation. Set A is called the domain, and set B is called the co-domain …

The concept of a function was formalized at the end of the 19th century in terms of set theory, and this greatly increased the possible applications of the concept. A function is often denoted by a letter …

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 …

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 …

There are many types of functions, including quadratic functions, trigonometric functions (sine, cosine, tangent), square root functions, inverse functions, composite functions and more.

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 …

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 into the function, you get only …

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.