00781nam0-22002411i-450-990001177890403321000117789FED01000117789(Aleph)000117789FED01000117789--------d--------km-y0itay50------baeng<<A >>chapter in the theory of linear operators in Hilbert spaceby FRIEDRICHS K.O.New YorkNew York University Press1951New York University Institute of Mathematical SciencesFriedrichs,Kurt Otto40614ITUNINARICAUNIMARCBK99000117789040332121-A-32890MA1MA1Chapter in the theory of linear operators in Hilbert space341961UNINA