Élie Joseph Cartan was an influential French mathematician who did fundamental work in the theory of Lie groups, differential systems, and differential geometry. He also made significant contributions to general relativity and indirectly to quantum mechanics. He is widely regarded as one of the greatest mathematicians of the twentieth century.
Professor Élie Joseph Cartan
Henri Paul Cartan was a French mathematician who made substantial contributions to algebraic topology.
Henri Cartan in 1968