Unit 1 Section 4 : Set Notation
In this section we look at some mathematical notation for the ideas we learnt about sets in the last section.

We use to denote the universal set, which is all of the items which can appear in any set.
This is usually represented by the outside rectangle on the venn diagram.


A B represents the intersection of sets A and B.
This is all the items which appear in set A and in set B.


A B represents the union of sets A and B.
This is all the items which appear in set A or in set B or in both sets.

' 
We use ' (the apostrophe) to denote the complement of a set.
A' is all the items which are not in set A.


A B means that set A is a subset of set B.
This means that every member of set A also appears in set B.


is the empty set  a set with no items in it.
For example, if A is the set of numbers which are both odd and even then A = .

Practice Questions
Work out the answer to each of these questions then click on the button marked
to see whether you are correct.
Exercises
Work out the answers to the questions below and fill in the boxes. Click on the
button to find out whether you have answered correctly. If you are right
then will appear and you should move on to the next
question. If appears then your answer is wrong. Click
on to clear your original answer and have another go.
If you can't work out the right answer then click on
to see
the answer.
When filling in the sets or venn diagrams below, separate the numbers in each section with commas:
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You have now completed Unit 1 Section 4
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Produced by A.J. Reynolds February 2011
