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E 44-0366 [Internet Resource]
Metamath proof explorer
URL: http://us.metamath.org/mpegif/mrnset.html
[Visited Jun'06] This fascinating and utterly baroque Web site contains more than 5,000 computer-verified formal proofs, definitions, and axioms in logic and set theory. These are organized in a consistent, colorcoded, completely hypertextualized manner so that the user can click backward...
