Solution to the Hardest Logic Puzzle Ever

By Cuong Q. Nguyen
Last semester I posted a riddle regarded by a number of contemporary philosophers as the “hardest” logic puzzle in the world. Raymond Smullyan, a prominent logician and philosopher, has a number of logic puzzles available online for people to solve, and this particular puzzle received a lot of attention from our readers. After some considerable delay, here is both my solution and various other solutions to the puzzle. Enjoy!
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