RIP Raymond Smullyan, Puzzle-Creating Logician

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And here are some more.

I’d never heard of Smullyan until today, and now I want to buy his books. RIP.

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They’re marvelous. I fondly remember To Mock a Mockingbird, which is, in essence, about abstract algebra (at least the parts that aren’t logic-like as all of his puzzle books seem to have lots of those types of problems).

You find yourself in a country where some people always tell the truth, and some people always lie. The latter group has taken over the government.

You meet a man who claims to be the President. Is he?


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