The Set theory reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Set theory

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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