Page 26 - Math Booklet Prep1first part1_Neat
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Types of sets
• Finite set : it has a fixed number of elements:
A = {2 , 3 , 5} C = {1 , 2 , 3 , ……… , 1000}
B = {7} D = {3 , 5 , 7 , ……… 99}
• Infinite set: it has no fixed number of elements as :
A = {1 , 2 , 3 , …….} B = {0 , 2 , 4 , 6 ,……… }
C = {1 , 3 , 5 , 7, ……}
• Empty set: (null set) it has no elements and denoted by Ø or { }
A = set of whole number between 2 and 3
B = set of your friends living on the moon.
Belonging to
The phrase "belong to" is used in set theory to indicate that
an element is a member of a particular set. This is typically
denoted using the symbol ?
•If x is an element of the set A, we say that "x belongs to A"
•and write x?A
•If y is not an element of the set A, we say that "y does not belong to A“
and write y?A
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