Sets and Venn diagram Flashcards
1
Q
∅
A
empty set
(the set of with no elements)
2
Q
A ∪ B
A
The union of A and B
(everything in A or B or both)
3
Q
A ⊆ B
A
A is a subset of B
(every element in A is also in B)
4
Q
A ⊄ B
A
A is not a proper subset of B
5
Q
A ∩ B
A
The intersection of A and B
(the overlap of A and B)
6
Q
A’
A
The complement of A
(everything outside A)
7
Q
n(A)
A
The number of elements in set A
8
Q
a ∈ A
A
An element of A
(a is in the set A)
