Whose contributions to math came later, Eugen Slutsky or Vladimir Arnold?
Eugen Slutsky Evgeny "Eugen" Evgenievich Slutsky ( ; ( Евге́ний Евге́ньевич Слу́цкий) 7 April [O.S. 19 April] 1880 – 10 March 1948) was a Russian/Soviet mathematical statistician, economist and political economist.
Leonid A. Umansky Leonid Alexandrovich Umansky (July 23, 1890 – April 3, 1957) was a Russian electrical engineer and a recipient of the IEEE Edison Medal for "outstanding contribution to the electrification of industry through the application of electrical machines, devices, and systems to automatic process machinery; and for his inspiration, leadership, and teaching of men in this work".