Which mathematician was the father of physicist Nikolai Borisovich Delone: Jakow Trachtenberg or Boris Delaunay?
Jakow Trachtenberg Jakow Trachtenberg (17 June 1888 – 1953) was a Jewish mathematician who developed the mental calculation techniques called the Trachtenberg system.
Albert Schwarz Albert Solomonovich Schwarz (Russian: А. С. Шварц ; born June 24, 1934 in Kazan, Soviet Union) is a mathematician and a theoretical physicist educated in the Soviet Union and now a professor at the University of California, Davis.