Originally published at: http://boingboing.net/2017/02/13/rip-raymond-smullyan-puzzle-c.html
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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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