What Is a Paradox?
7. The Liar Paradox
The liar paradox is perhaps one of the best known of all paradoxes and it is often found in literature. It simply starts with somebody making the claim: this sentence is a lie. It results in a paradox that has been examined by logicians for as long as it has been around.
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If the sentence is a lie then the person making the statement is, indeed, telling the truth when making the statement. If the person making the claim was telling the truth, however, it would mean that the statement must be a lie, so the person making the claim cannot have been telling the truth.
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