Sets
A
set
is an unordered collection of objects
Examples: {apple,orange,pear} is a set.
{1,2,3,4,5} is a set.
The objects of a set are called the
elements
(or
members
) of a set. The set is said to
contain
its elements.

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Notation
= The set of all real numbers
= The set of all integers
= The set of all positive integers {1,2,3,...}
= The set of natural numbers {0,1,2,3,...}
= The set of all rational numbers
="belongs to", or "is a member of"
"does not belong to", "is not a member of"
is the same as
(
)
x
A
x
A