Discrete Mathematics

List of Symbols

Symbol	Meaning
Chapter One
∈	belongs to, is an element of
{a, b}	set consisting of a and b
∉	does not belong to, is not an element of
R	the set of real numbers
Z	the set of integers
Z+	the set of positive integers
N	the set of natural numbers
ɸ	empty set, null set, void set
⊆	set inclusion, is a subset of
	is not a subset of
⇔	if and only if
P(A)	the power set of the set A, the set of all subsets of the set A
|A|	the number of elements in the set A, cardinality of a finite set A
U	universal set, universe of discourse
∪	union of sets
∩	intersection of sets
B − A	relative complement of the ...