A = B

the two sets A and B have exactly the same elements if A = {1, 2, 3} and B ={ 2, 1, 3}, then A = B

n(A)

the number of elements in A

when A contains an unlimited collection of elements we call it an infinite set

∈

element (member) of

∉

not an element (member) of

What is the symbol, meaning and mathematical name of this diagram?

meaning = elements in A or B or both

mathematical name = union

What would the picture of this symbol look like?

(assuming there is only set A and set B)

What is the symbol, meaning and mathematical name of this diagram?

meaning = elements in both A and B

mathematical name = intersection

What would the picture of this symbol look like?

A ∩ B

(assuming there is only set A and set B)

What is the symbol, meaning and mathematical name of this diagram?

meaning = elements not in set A

mathematical name = complement

what would the picture of this symbol look like?

(assuming there is only set A and set B)

What is the symbol, meaning and mathematical name of this diagram?

meaning = elements not in set B

mathematical name = complement

what would the picture of this symbol look like?

(assuming there is only sets A and B)

What is the symbol, meaning and mathematical name of this diagram?

meaning = elements not in A∪B

mathematical name = not in union

what would the picture of this symbol look like?

(assuming there is only set A and set B?)

What is the symbol, meaning and mathematical name of this diagram?

meaning = elements not in A or it is in B

no mathematical name

what would the picture of this symbol look like?

(assuming there is only set A and set B)

{ }

set

a collection of elements

Ø

empty set

Of the 26 cars on a garage forecourt, 12 had ABs brakes, 16 had a C-D player and 6 had neither ABs brakes or a C-D player

Find how many cars had both ABS brakes and a C-D player

What is the symbol and meaning?

everything in the overlap of B and C

What is the symbol and meaning?

Everything in D or E or both

What is the symbol and meaning?

everything not in H

What is the picture and meaning of this symbol?

(assuming there is D, E and F)

everything in D or E or both

What is the picture and meaning?

(assuming there is only H, I and J)

everything not in H

What is the picture and meaning?

(assuming there is A, B and C)

everything in the overlap of B and C

What is the symbol and meaning?

everything not in R

What is the symbol and meaning?

everything in the overlap of K, L and M

What is the symbol and meaning?

everything in S, T, U or both

What is the picture and meaning?

(assuming there is P, Q and R)

everything not in R

What is the picture and meaning?

(assuming there is K, L and M)

everything in the overlap of K, L and M