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You know you're getting old when all the names in your black book have M. D. after them.

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Jan 20, 2026

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Quote Author: Henri Léon Lebesgue

Henri Léon Lebesgue

Henri Léon Lebesgue

Henri Léon Lebesgue [ɑ̃ʁiː leɔ̃ ləˈbɛg] (June 28, 1875, Beauvais - July 26, 1941, Paris) was a French mathematician, most famous for his theory of integration. Lebesgue's integration theory was originally published in his dissertation, Intégrale, longueur, aire ("Integral, length, area"), at the University of Nancy in 1902.

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