Who was a Soviet mathematician active in number theory, probability theory and mathematical statistics, Boris Galerkin or Yuri Linnik ?
Boris Galerkin Boris Grigoryevich Galerkin (Russian: Бори́с Григо́рьевич Галёркин , surname more accurately romanized as Galyorkin; 4 March [O.S. 20 February] 1871  – 12 July 1945), born in Polotsk, Vitebsk Governorate, Russian Empire, was a Jewish Soviet mathematician and an engineer.
Vladimir Gennadievich Sprindzuk Vladimir Gennadievich Sprindzuk ("Russian" Владимир Геннадьевич Спринджук, "Belarusian" Уладзімір Генадзевіч Спрынджук, 22 July 1936, Minsk – 26 July 1987) was a Soviet-Belarusian number theorist.