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.
Pierre Delaunay Pierre Delauney (born 9 October 1919) was the second General Secretary of UEFA. He succeeded his father Henri Delaunay in the post, on an interim basis from his father's death on 9 November 1955 and then officially from 8 June 1956.