"The first sign of senility is that a man forgets his theorems, the second sign is that he forgets to zip up, the third sign is that he forgets to zip down."
— Paul Erdős

January 1, 1970

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Added on April 10, 2026
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AgnosticsPeople from BudapestAcademics from HungaryMathematicians from HungaryJews from Hungary
Original Language: English

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There are three signs of senility. The first sign is that a man forgets his theorems. The second sign is that he forgets to zip up. The third sign is that he forgets to zip down.