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Tonsil stones

Name: Tonsil stones 2011-10-27 7:06

Tonsil stones

Name: Anonymous 2011-10-27 7:43

Hi Namefag,  I didn't see your post

Name: Anonymous 2013-09-01 13:32


In 1922, Adolf Fraenkel and Thoralf Skolem independently improved Zermelo's axiom system. The resulting 10 axiom system, now called Zermelo-Fraenkel axioms (ZF), is now the most commonly used system for axiomatic set theory.

Name: Anonymous 2013-09-01 15:50


Some basic sets of central importance are the empty set (the unique set containing no elements), the set of natural numbers, and the set of real numbers.

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