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.
Martin Wilhelm Kutta Martin Wilhelm Kutta (] ; 3 November 1867 – 25 December 1944) was a German mathematician.