Chapter 3

Question 1

Define “relation”

Answer 1

A relation is a correspondence between two sets: a set X (domain) and a set Y (range). In a relation, each element from the domain corresponds to at least one element from the range.

Question 2

Define “Function”

Answer 2

Let X and Y be two nonempty sets. A function from X into Y is a relation that associates with each element of X exactly one element of Y.