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L6 - Sets A set is an unordered collection of objects...

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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 
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