00907nam0 2200277 450 00000964620080410114044.00-387-90076-43-540-90076-420080410d1973----km-y0itay50------baengUSy-------001yySpectral theory of operators in Hilbert spaceK. O. FriedrichsNew YorkHeidelbergBerlinSpringer-Verlag1973VIII, 244 p.26 cmApplied mathematical sciences00092001Applied mathematical sciences0009MatematicaTeorie510.820MatematicaFriedrichs,Kurt Otto40614ITUNIPARTHENOPE20080410RICAUNIMARC000009646AMS 510/923745NAVA120080410Spectral Theory of Operators in Hilbert Space342046UNIPARTHENOPE