Sets Flashcards
1
Q
a ∈ A
A
a is an element of the set A.
2
Q
2 properties of sets
A
No order, No repeats.
3
Q
Set U
A
Universal set. Contains all possible values.
4
Q
A ⊆ B
A
A is a subset of B. Every (or some) element in set A is within set B.
5
Q
A ⊂ B
A
A is a proper subset of B. Some elements of set A are within set B
6
Q
A ∪ B
A
A union B. Set which contains all elements from sets A and B.
7
Q
A ∩ B
A
A intersection B. Set which contains only the elements which appear in set A and set B.
8
Q
A \ B
A
A Difference B. A set containing all elements in A which are not in B.
9
Q
A Δ B
A
A Symmetric Difference B. Set containing only elements which don’t repeat between A and B.
10
Q
(a,b)
A
Ordered pair. Order is maintained.
11
Q
A x B
A
Cartesian Product. Set where all elements are all ordered pairs of (A,B)
