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American Government Biology College Mathematics General CLEP General Tips Human Growth And Development Humanities Introductory Psychology Principles Of Marketing Sociology US History 1 US History 2What are Sets?
Usually when you write out sets they are shown as following. Taking our example of all the odd number between 1 and 10 we would write this as: S={1,3,5,7,9} where S just stands for set, and the brackets contain the set itself. Also note that S can be anything so in the previous example it could have been E={1,3,5,7,9}. The numbers within the brackets are called elements. So in this example 1,3,5,7,9 are elements of S.
There is also a special way to write The symbol for elements is∈∉ so you could say 3 ∈ S. If a number is not in the set you put a line through the is in symble, such as 2 ? S .
Sample Problems
Write Out the set for : A={Even Whole Numbers Between 1 and 11}
Is 6 ∈A?
Is 8 ∉ A?
If ∈ is a box your probably using internet explorer. It doesn't render this symbol right. Basically it looks like an "E". This page is best viewed in Firefox download it here.