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.
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.