fonction
A fonction is a foundational concept in mathematics and related disciplines. In its most general sense, a fonction is a rule that assigns to every element of a domain X exactly one element of a codomain Y. It is typically denoted as f: X → Y, with f(x) = y indicating that x in X maps to y in Y. The set X is called the domain, the target set Y the codomain, and the outputs {f(x) : x in X} form the fonction’s range.
Functions can be classified by properties such as injectivity (one-to-one), surjectivity (onto), and bijectivity (both). A
Typical examples: f: R → R, f(x) = x^2 is a fonction whose domain is all real numbers but
Beyond pure mathematics, the concept appears in computing as a function (or method) that takes inputs (parameters)
Terminology: in some languages the term fonction is used for mathematical contexts in the French tradition;