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.
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.