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http://en.wikipedia.org/wiki/M%C3%BCnchhausen_Trilemma

Münchhausen Trilemma - Wikipedia, the free encyclopedia

The Münchhausen Trilemma (after Baron Münchhausen , who allegedly pulled himself and the horse on which he was sitting out of a swamp by his own hair ), also called Agrippa's Trilemma (after Agrippa the Skeptic ), is a philosophical term coined to stress the purported impossibility to prove any truth even in the fields of logic and mathematics.