00381nam a2200109Ia 4500008004100000082001900041100001700060245007000077260003800147630001800185650006800203211109s9999||||xx |||||||||||||| ||und||  a515.724bBRO-I  aBrown, Arlan 0aIntroduction to Operator Theory 1:Elements of Functional Analysis  bSpringer - VerlagaNEW YORKc1977  xGeneral Stack  aNatural SciencesvMathematicsxMathematical AnalysisMathematics