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View Resource Metamath Proof Explorer Home Page

Theoretical mathematicians, behold the wondrous Metamath Proof Explorer! This site consists of interconnected Webpages containing over 3,000 completely worked out proofs in logic and set theory. "Each proof is pieced together with razor-sharp precision using simple rules, allowing almost anyone with a technical bent to follow it without difficulty. With point-and-click links, every step can be...

http://us.metamath.org/mpegif/mmset.html