Henri Lebesgue
Henri Léon Lebesgue ForMemRS (June 28, 1875 – July 26, 1941) was a French mathematician most famous for his theory of integration, which was a generalization of the 17th 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.
Read more about Henri Lebesgue: Personal Life, Mathematical Career, Lebesgue's Theory of Integration
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