You must understand the meaning and structure of function notation. Functions can be defined and described in various ways.

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## Glossary

### function

A rule that connects one value in one set with one and only one value in another set.

### union

The union of two sets A and B is the set containing all the elements of A and B.

**Full Glossary List**

More in this topic

1 Function notation

2 Investigate Odd and Even Functions

3 Explore Composite Functions 2

4 Exam Question

5 Exam Question

6 Match Composite Functions 2

7 Exam Question

8 Exam Question

9 Introduction

10 Evaluating

11 Values of functions

12 Values of functions 2

13 Values of functions 3

14 Values of functions 4

15 Composition 3

16 Exam Question

17 Even functions

18 Even functions 2

19 Even functions 3

20 Odd functions

21 Odd functions 2

22 Odd functions 3

23 Exam Question

24 O-test 5

25 True or false O-test 1

26 True or false O-test 2

27 O-test 6

28 Matching O-test 1

29 Matching O-test 2

30 Exam Question

31 Exam Question

32 Exam Question

33 Exam Question

34 Exam Question

35 Exam Question

36 Exam Question

37 Exam Question

38 Exam Question

39 Exam O-test

40 Exam timed O-test