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.
Johann Philipp Neumann Johann Philipp Neumann (27 December 1774 – 3 October 1849) was an Austrian physicist, librarian and poet.