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.
Sergei Nikolaevich Chernikov Sergei Nikolaevich Chernikov (11 May 1912 – 23 January 1987; Russian: Сергей Николаевич Черников ) was a Russian mathematician who contributed significantly to the development of infinite group theory and linear inequalities.