French mathematician born September 18, 1752 in Paris and died on January 10, 1833 in the same city, who have much of the metods of mathematical analysis of physical theories. He/She was member of the Institute and Professor of mathematics at the Ă‰cole militaire in Paris, and made great progress in several branches of science, and can cite his theorem on the solution of the spherical triangles of sides small, their discoveries on the theory of numbers, its method of smaller squares, etc. It also left many works of merit, such as: elements of geometry; Integral calculus exercises; Treaty of elliptic functions with the comprehensive Eulerian; Theory of numbers; Research on the figure of the planets; etc.