00297nam a2200121Ia 4500082002000000100002300020245002700043260004900070300000600119490004000125500000500165700000500170  a515.72bN491.FO  aNeumann, John Von.  aFunctional operatorsb  aNew JerseybPrinceton University Pressc1950  a   aAnnals of Mathematics studies v 21  a  a