Definition
A set is an unordered collection of objects, called elements or members of the set. It is common for sets to be denoted using uppercase letters. Lowercase letters are usually used to denote elements of sets.
Practical Example.
We can take the fruits as elements of the set basket!
Note:
-
Order is not important.
S= {a,b,c,d} = {b,c,a,d} -
Each distinct object is either a member or not; listing more than
once does not change the set.
S= {a,b,c,d} = {a,b,c,b,c,d} -
Elipses(...) may be used to describe a set without listing all of
the members when the pattern is clear.
S= {a,b,c,d, ...,z}