Henri Lebesgue

Henri Léon Lebesgue was a French mathematician known 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 at the University of Nancy during 1902.

28 June 1875

Born on the same birth day (28 June): Adolfo Schwelm Cruz • Artur Hajzer • Brandon Phillips • Dan Stains • Georges Wolinski • Giovanni della Casa • Heinrich Albert (composer) • Jens Birkemose • Jessie Baetz • Joseph P. Lordi • Junior Johnson • Leona Aglukkaq • Luigi Pirandello • Muhammad Azam Shah • Oscar Hiljemark • Sonata Tamošaitytė • Wilhelm Steinkopf

Born in the same month (June 1875): Charles Stewart Mott • Ernst Enno • Forrest Reid • Henry Hallett Dale • Herman Smith-Johannsen • Paul Neumann (swimmer) • Reginald Punnett • Thomas Mann