# Surjective Function

##### Updated: October 21, 2020

A function is surjective or “onto” if

For

every\(y \in Y\), there exists \(x \in X\) such that \(f(x) = y\).

A function is surjective or “onto” if

For

every\(y \in Y\), there exists \(x \in X\) such that \(f(x) = y\).