Sets Symbols Flashcards
1
Q
∈
A
Is an element of
2
Q
∉
A
Is not an element of
3
Q
⊆
A
Subset of
4
Q
⊂
A
Proper subset of
5
Q
∩
A
Intersection. Ex. A ∩ B : The set of everything in both A and B.
6
Q
∪
A
Union. A ∪ B : The set of everything in either A or B.
7
Q
|R
A
The reals. The numbers of a number line.
8
Q
Z
A
The integers. Whole numbers, positive, negative and 0.
9
Q
N
A
Positive whole numbers. The Naturals
10
Q
Q
A
Numbers that can be expressed as integer fractions like
7/5 or -2/9.
11
Q
∅
A
The null set. The set with nothing in it, {}
12
Q
≡
A
Equal by defin
13
Q
mModn
A
m mod n
14
Q
<Set>+
</Set>
A
Positive <Set></Set>
