00779nam0-22002651i-450-990001178000403321000117800FED01000117800(Aleph)000117800FED0100011780020000920d1961----km-y0itay50------baengSpectral Theory of Operators in Hilbert Spaceby FRIEDRICHS K.O.New YorkCourant Institute of Mathematical Sciences1961Teoria degli operatoriFriedrichs,Kurt Otto40614ITUNINARICAUNIMARCBK9900011780004033216-E-22a7527MA1MA147-02Spectral Theory of Operators in Hilbert Space342046UNINAING01