Question: Which mathematician was the father of physicist Nikolai Borisovich Delone: Jakow Trachtenberg or Boris Delaunay?
Sentence (from "Nikolai Borisovich Delone"): Nikolai Delaunay, Jr. (aka Delone, Nikolai Borisovich) (22 May 1926 – 11 September 2008) was a born in Leningrad, USSR (now Saint Petersburg, Russia).
Relevant evidence: No