Lecture 11 (Discrete Math) Functions and Function Composition

A relation f is a function provided that:

1. A.If (a, b) and (a, c) are in f, then b = c.
2. B.If (a, b) and (c, b) are in f, then a = c.
3. C.Every element of the codomain appears as a right-hand element.
4. D.The set of ordered pairs is finite.