Henri Léon Lebesgue 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.
