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A comment on A liar who always lies says "All my hats are green.". Parent comment

Re:A liar who always lies says "All my hats are green." by fortran77 on Monday December 09, 2024 @12:07PM (#42367995)
In the world of logic puzzles, it is understood that a "liar" never makes a true statement, and that "vacuously true" statements are false.
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Re:A liar who always lies says "All my hats are green." by dingaling on Monday December 09, 2024 @01:01PM (#42368590)
Which seems to be an untenable premise.

"I never make a true statement" says the liar.

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Re:A liar who always lies says "All my hats are green." by latexr on Monday December 09, 2024 @01:23PM (#42368874)
> "I never make a true statement" says the liar.

I’ve never seen one of this puzzles phrasing it like that. With good reason, that would break the puzzle.

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Re:A liar who always lies says "All my hats are green." by JadeNB on Monday December 09, 2024 @01:10PM (#42368714)
> In the world of logic puzzles, it is understood that a "liar" never makes a true statement, and that "vacuously true" statements are false.

I agree with the first stipulation, but, outside of Lewis Carroll's puzzles, I think that the second isn't true. For example, I believe you'll find just the opposite in Raymond Smullyan's books.

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