The creater of von Neumann's inequality, was what nationality?
Von Neumann's inequality In operator theory, von Neumann's inequality, due to John von Neumann, states that, for a fixed contraction "T", the polynomial functional calculus map is itself a contraction.
Heinz Bachmann Heinz Bachmann (born 1924) is a mathematician who worked at the Eidgenössische Sternwarte (federal observatory) in Zurich. He introduced the Bachmann-Howard ordinal and ordinal collapsing functions.