Sets Flashcards
1
Q
Is an element of
A
∈
2
Q
Is not an element of
A
∉
3
Q
Number of elements in the set/cardinal number
A
#
4
Q
Empty set/no elements/null set
A
∅ or { }
5
Q
Subset
A
⊂
6
Q
Not a subset
A
⊄
7
Q
Union/all elements contained in both sets
A
∪
8
Q
Intersection/the elements common in both sets
A
∩
9
Q
The set that contains all elements/universal set
A
U
10
Q
Complement/everything outside of A
A
A’ or Ac
11
Q
Set difference/elements that are in X but not in Y
A
X/Y or X−Y
12
Q
Equal to
A
=
13
Q
Not equal to
A
≠
