Let f be a function from A to B, then f is ___ function if Range (f) = B.
Let f be a function from A to B, then f is ___ function if Range (f) = B.
Explanation
A function f: A → B is called onto (surjective) if Range(f) = B, meaning every element in B has at least one preimage in A.
In other words, for every b ∈ B, there exists a ∈ A such that f(a) = b.