Within any scenario where only "yes" or "no" answers are accepted, a person who we know is consistently lying would "paradoxically" be a source of truth if "yes" is sometimes the correct answer. There are many such paradoxes, the most famous being known as the liar paradox, commonly expressed as "This sentence is a lie," or "This sentence is false." The so-called Epimenides paradox ("All Cretans are liars," as stated by Epimenides the Cretan) is a forerunner of this, though its status as a paradox is disputed. A class of related logic puzzles are known as knights and knaves, in which the goal is to determine who, in a group of people, is lying and who is telling the truth.
Read more about this topic: Liar
Other articles related to "paradoxes":
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Famous quotes containing the word paradoxes:
“The so-called paradoxes of an author, to which a reader takes exception, often exist not in the authors book at all, but rather in the readers head.”
—Friedrich Nietzsche (18441900)
“The way of paradoxes is the way of truth. To test Reality we must see it on the tight-rope. When the Verities become acrobats we can judge them.”
—Oscar Wilde (18541900)
“The paradoxes of today are the prejudices of tomorrow, since the most benighted and the most deplorable prejudices have had their moment of novelty when fashion lent them its fragile grace.”
—Marcel Proust (18711922)