Bijective Function — Identify From a Diagram

Bijective (one-one and onto)

Explanation

This mapping is bijective: every domain element maps to a distinct codomain element (one-one: \(a \to 1,\ b \to 2,\ c \to 3\) — all different), and every codomain element is hit (onto: \(1, 2, 3\) are all images). A bijective function is also called a one-to-one correspondence.