But a function doesn't really have belts or cogs or any moving parts, and it doesn't actually destroy what we put into it! A function relates an input to an output.

In several areas of mathematics, the term "function" refers to partial functions rather than to ordinary (total) functions. This is typically the case when functions may be specified in a way …

Sep 29, 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).

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 …

Jul 23, 2025 · What is a Function in Maths? In mathematics, a function is a relationship or rule that assigns each input (often called the domain) to exactly one output (often called the co …

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 …

Definition of a function and function notation A function is a relation such that for each x -value there is only one corresponding y -value. In other words, a function cannot contain two …