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Discrete math Cheat Sheet (DRAFT) by

This is a draft cheat sheet. It is a work in progress and is not finished yet.

Common Sets

N
All Natural numbers = {1, 2, 3, 4, ...}
Z
All Integers = {..., −2, −1, 0, 1, 2, ...}
Z+
All Positive integers = {0, 1, 2, ...}
Q
All Rational numbers
R
All real numbers
W
All whole numbers
 

Examples

4 ∈ A
4 is an element of A
2 ∉ A
2 is not an element of A
|A| = 5
The size of A is 5
CARD(A) = |A|
Cardin­ality of A is 5
Consider: A = {1, 3, 8, 10, 18}
  

Examples (copy)

4 ∈ A
4 is an element of A
2 ∉ A
2 is not an element of A
|A| = 5
The size of A is 5
CARD(A) = |A|
Cardin­ality of A is 5
Consider: A = {1, 3, 8, 10, 18}