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The Hardest Logic Puzzle Ever
The Hardest Logic Puzzle Ever is a logic puzzle invented by American philosopher and logician George Boolos and published in The Harvard Review of Philosophy in 1996. A translation in Italian was published earlier in the newspaper La Repubblica , under the title L'indovinello più difficile del mondo . The puzzle is inspired by Raymond Smullyan .Clever student: I know! Now we just plug in x=0, and we see that zero to the zero is one!

