Set theory notation Flashcards
1
Q
A = {1,2,3,4}
A
-A is a set with the elements 1,2,3,4 in it
-items in a set can’t be repeated
2
Q
2 ∈ A
A
2 is a element of set A
3
Q
6 ∉ A
A
6 is not a element of set A
4
Q
A ⊂ B
A
A is a proper subset of B, where all elements in A are in B but B has more elements
5
Q
A ∪ B
A
-union
-elements in A or B or both
6
Q
A ∩ B
A
-intersection
-elements in both A and B
7
Q
n(A)
A
cardinality - number of elements in set A
8
Q
A’ = {5,7,24}
A
complement of A - elements not in set A
9
Q
{} or Ø
A
the empty set
10
Q
ξ
A
the universal set
11
Q
A is a set with the elements 1,2,3,4 in it
A
A = {1,2,3,4}
12
Q
2 is a element of set A
A
2 ∈ A
13
Q
6 is not a element of set A
A
6 ∉ A
14
Q
A is a proper subset of B, where all elements in A are in B but B has more elements
A
A ⊂ B
15
Q
-union
-elements in A or B or both
A
A ∪ B
