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.
Grigorii Khanin Grigorii Isaakovich Khanin (Russian: Григорий Исаакович Ханин , born 11 June 1937) is a Russian economist best known for his 1987 recalculation of official Soviet economic growth statistics. After the collapse of the USSR he began recalculating Russian economic statistics. His recalculations differed substantially from the official figures, particularly for the value of the capital stock.