Set Learning

Math help! What resources to simplify the learning theory sets itself?

I need to learn notation used, and at least one example of this "set theory" applied to something. Thank you.

This is great Sources: http://en.wikipedia.org/wiki/Set_theory http://www.seop.leeds.ac.uk/entries/set-theory/ http://www.math.csusb.edu/ notes / games / sets.html

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