Liar Paradox - 0 views
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Let L be the Classical Liar Sentence. If L is true, then L is false. But we can also establish the converse, as follows. Assume L is false. Because the Liar Sentence is just the sentence that ‘says’ L is false, the Liar Sentence is therefore true, so L is true. We have now shown that L is true if, and only if, it is false. Since L must be one or the other, it is both.
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The following sentence is true. The following sentence is true. The following sentence is true. The first sentence in this list is false.
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A sentence is true if, and only if, what it says is so.