Sets

Question 1

What do we mean by “Sets are Egalitarian”?

Answer 1

They are unordered.

Question 2

What does the symbol ø mean?

Answer 2

Empty set, null set, or {}

Question 3

What does A⊂B mean?

Answer 3

A is a subset of B; all members of A are members of B

All sets are subsets of the Universal set

Question 4

If A⊂B, may A=B?

Answer 4

Yes - perfectly allowed

Question 5

What does A∩B mean?

Answer 5

The set of members of A which are also members of B

I.e. members which are in A AND B

Question 6

What does A∪B mean?

Answer 6

The set of all members of A and all members of B

I.e. members which are in A OR B

Question 7

What does |A| mean?

Answer 7

The cardinality of set A

i.e., how many members are in A

Question 8

What is the cartesian product of A and B (AXB)?

A = {1, 2, 3}

B = {i, j}

Answer 8

{(1, i), (1, j), (2, i), (2, j), (3, i), (3, j)}