Pre-requisites Flashcards
1
Q
Null Set
A
∅ or {}
2
Q
Set of Natural Numbers
A
N = {1, 2, 3, …}
3
Q
Set of Integers
A
Z = {…, -3, -2, -1, 0, 1, 2, 3, …}
4
Q
Set of Positive Integers
A
Z+ = {1, 2, 3, …} = N
5
Q
Set of Negative Integers
A
Z- = {…, -3, -2, -1}
6
Q
Set of Non-positive Integers
A
Z+0 = {0, 1, 2, 3, …}
7
Q
Set of Non-negative Numbers
A
Z-0 = {…, -3, -2, -1, 0}
8
Q
Set of Rational Numbers that can be expressed in the form of a/b, where a,b ∈ Z and b ≠ 0.
A
Q = {1/2, 3/4, -5/6, 7, -0.89898989, …}
9
Q
Set of Real Numbers
A
R
10
Q
Subset
A
A ⊆ B
11
Q
Proper Subset
A
A ⊂ B
12
Q
Union of 2 Sets
A
A ∪ B
13
Q
Intersection of 2 Sets
A
A ∩ B
14
Q
Complement of a Set
A
A’
15
Q
Open Interval, (a, b)
A
x ∈ R: a < x < b
