Lecture 11 (Discrete Math 2020) Part 2

A function f is one-to-one provided that:

1. A.If a = b, then f(a) = f(b).
2. B.Every element of the codomain is hit by some input.
3. C.The function passes the vertical line test on its graph.
4. D.If f(a) = f(b), then a = b.