sets Flashcards
1
Q
A ∪ B:
A
both A or B
2
Q
A ∩ B:
A
numbers both in A & B
3
Q
A ⊆ B:
A
every element of A is in B
4
Q
Ø:
A
empty set
5
Q
a ∈ A:
A
a is in A
6
Q
b ∉ A:
A
b is not in A
7
Q
A ⊂ B:
A
A ⊂ B
8
Q
A’:
A
everything not in A
9
Q
n(A):
A
number of items in set A