Which Russian mathmatician contributed to number theory, Grigori Perelman or Ivan Fesenko?
Grigori Perelman Grigori Yakovlevich Perelman (Russian: Григо́рий Я́ковлевич Перельма́н ; ] ; born 13 June 1966) is a Russian mathematician. He made a contribution to Riemannian geometry and geometric topology.
Lev Gutenmaher Lev Israilevich Gutenmaher (Russian: Лев Изра́илевич Гутенма́хер ) was a Soviet mathematician who conducted pioneering research in the area of computing technologies and made significant contributions to the early development of computer science. He was a recipient of the Stalin and National awards for his work.