00830nam0-22002651i-450-990001177920403321000117792FED01000117792(Aleph)000117792FED0100011779220000920d1965----km-y0itay50------baengPerturbation of Spectra in Hilbert Spaceb y FRIEDRICHS K.O.ProvidenceAmerican Mathematical Society1965Lectures in Applied Mathematics. Proceedings of the Summer Seminar, Boulder, Colorado 1960VOL III.Friedrichs,Kurt Otto40614ITUNINARICAUNIMARCBK990001177920403321C-41-(311159MA1MA1Perturbation of spectra in Hilbert space81599UNINAING01