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Jack comments on Unsolved Problems in Philosophy Part 1: The Liar's Paradox - Less Wrong
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I take it the problem is that it doesn't unpack even though it does have a truth value. Or at least it isn't obvious how to unpack it. It's a false negative candidate.
So the point is that it is a sentence that demonstrates a problem with using unpackability as a requirement for qualifying as meaningful English? That seems reasonable.
That's what I got from it.
Note that the universal "All sentences are either true or false" also, doesn't appear to meet the unpackability requirement, though I'm not confident I know how to make a Tarski sentence out of that.