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• David Kaplan and Richard Montague　　“A Paradox Regaind”,　in: Notre Dame Journal of Formal Logic, vol. 1, 1960

知者(The Knower)のパラドックスで有名な論文のため、入手。このパラドックスは次のようなパラドックスとのことである*1。

(K) I know this assertion, K, is false.

If K is true it is false, because I know it; so it's false. But since I know that, I know it's false, which means it is true. So it is both true and false.

*1:cf. Michael Clark　　Paradox from A to Z, London, Routledge, 2002, p. 94.