• To understand what a function is. • To use function notation. • To understand the composition of functions. • To understand the concept of the limit of a function.
Introduction
Five students sit a test where the grades that can be awarded are A, B, C, D, E and F. The results of the test are as follows:
KEY TERM
The domain of a function is the set of values which is mapped by a function.
KEY TERM
The range of a function is the set of images obtained by mapping the elements of the domain.
Anne (B) John (C) Mary (A) Paul (B) Sandra (D)
There is a relation between the student and the grade received. A set S of ordered pairs can be used to represent this relation.
The fi ve students form the elements of the domain. The grades that they can receive form the elements of the codomain. The range is the set of grades received by the students. The range is a subset of the codomain.