Set theory
From Wikipedia, the free encyclopedia.

The words set theory can be used to mean a number of subtly different things:

• Naive set theory is the original set theory developed by mathematicians at the end of the 19th century
• Axiomatic set theory is a rigorous axiomatic theory developed in response to the discovery of serious flaws (such as Russell's Paradox) in naive set theory.
• Various versions of logic have associated sorts of sets (such as fuzzy sets in fuzzy logic).
• Musical set theory may be considered the application of mathematical set theory to music.

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The original article can be found at: http://en.wikipedia.org/wiki/Set_theory.
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