quantum theory. He worked on the physical interpretation of non-self adjoining operators and he developed a theory of open systems which are physical systems which interact with the environment. These research is compiled in two monographs. After moving to Tbilissi with his family, he started working on a generalisation of the Cayley-Hamilton theorem. He moved to Israel in 1978 and settled in Beersheba. He became a professor at Ben-Gurion University of the Negev and started to work with Naftali Kravitsky on a theory of several commuting operators. References 1917 births 2007 deaths Soviet mathematicians Israeli mathematicians Soviet emigrants to Israel