One of the greatest mathematicians of his age, Poincaré made important contributions across the full range of mathematics, both pure and applied. He enlarged the field of mathematical physics through his work on the theory of functions, did notable work in differential equations and celestial mechanics, and also wrote extensively on the philosophy of science. He was elected to the Academy of Sciences in 1887 and the Academie Française in 1909. How many hours a day did he devote to his work? Discuss
Source: The Free Dictionary