Leonid Kantorovich and Vladimir Arnold both acted as what in the Soviet Union?
Vladimir Arnold Vladimir Igorevich Arnold (alternative spelling Arnol'd, Russian: Влади́мир И́горевич Арно́льд , 12 June 1937 – 3 June 2010) was a Soviet and Russian mathematician. While he is best known for the Kolmogorov–Arnold–Moser theorem regarding the stability of integrable systems, he made important contributions in several areas including dynamical systems theory, catastrophe theory, topology, algebraic geometry, symplectic geometry, differential equations, classical mechanics, hydrodynamics and singularity theory, including posing the ADE classification problem, since his first main result—the solution of Hilbert's thirteenth problem in 1957 at the age of 19.
Yuri Levitan Yuri Borisovich Levitan (Russian: Юрий Борисович Левитан , 2 October 1914 – 4 August 1983) was the primary Soviet radio announcer during and after World War II. He announced on Radio Moscow all major international events in the 1940s–60s including the German attack on the Soviet Union in 1941, the surrender of Germany on 9 May 1945, the death of Joseph Stalin, and the first manned spaceflight in 1961.