Which Russian mathmatician contributed to number theory, Grigori Perelman or Ivan Fesenko?
Ivan Fesenko Ivan Fesenko (Russian: Иван Борисович Фесенко ; born 1962) is a mathematician working in number theory and other areas of modern mathematics.
Yevgeny Svetlanov Yevgeny Fyodorovich Svetlanov (Russian: Евгéний Фёдорович Светлáнов ; 6 September 1928—3 May 2002) was a Russian conductor, composer and, though less well known for it, a pianist.