Are both Mark Krein and Grigory Margulis mathematicians?
Mark Krein Mark Grigorievich Krein (Ukrainian: Марко Григорович Крейн , Russian: Марк Григо́рьевич Крейн ; 3 April 1907 – 17 October 1989) was a Soviet Jewish mathematician, one of the major figures of the Soviet school of functional analysis. He is known for works in operator theory (in close connection with concrete problems coming from mathematical physics), the problem of moments, classical analysis and representation theory.
Vladik Kreinovich Vladik Kreinovich is Professor of Computer Science at the University of Texas at El Paso, El Paso, Texas, USA.