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.
Nikolai Chernykh Nikolai Stepanovich Chernykh (Russian: Николай Степанович Черных ) (6 October 1931 – 26 May 2004) was a Russian-born Soviet astronomer and discoverer of minor planets and comets at the Crimean Astrophysical Observatory in Nauchnij, on the Crimean peninsula.