Szolem Mandelbrojt was a Polish-French mathematician who specialized in mathematical analysis. He was a professor at the Collège de France from 1938 to 1972, where he held the Chair of Analytical Mechanics and Celestial Mechanics.
Szolem Mandelbrojt
Szolem Mandelbrojt, 1941
Jacques Salomon Hadamard was a French mathematician who made major contributions in number theory, complex analysis, differential geometry, and partial differential equations.
Jacques Salomon Hadamard