Henri Léon Lebesgue (French pronunciation: [ɑ̃ʁiː leɔ̃ ləˈbɛɡ]; June 28, 1875, Beauvais – July 26, 1941, Paris) was a French mathematician most famous for Lebesgue's theory of integration, which was a generalization of the seventeenth century concept of integration—summing the area between an axis and the curve of a function defined for that axis. His theory was published originally in his dissertation Intégrale, longueur, aire ("Integral, length, area") at the University of Nancy during 1902.
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