= Barber paradox
{wiki=Barber_paradox}
The Barber Paradox is a self-referential paradox related to set theory and logic, often attributed to the mathematician and philosopher Bertrand Russell. It presents a scenario involving a barber who shaves all and only those men who do not shave themselves. The paradox arises when we ask the question: "Does the barber shave himself?" If the barber shaves himself, according to the definition, he should not be shaving himself (because he only shaves those who do not shave themselves).
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