liar paradox

liar paradox
noun
: a semantical paradox associated with the Cretan philosopher Epimenides (†7th cent. B.C.) and occurring when someone says “I am lying” or “I am now asserting a falsehood” which is a true statement if it is false and a false one if it is true — compare epimenidean, russell's paradox

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a logical paradox that results from consideration of statements of the form "This statement is false." If the statement is true, then it is false, whereas if it is false, then it is true.
[1935-40]

Useful english dictionary. 2012.

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