01123nam a2200313 i 450099100122820970753620020507185618.0970609s1965 us ||| | eng b10818492-39ule_instLE01309009ExLDip.to Matematicaeng515.724AMS 46CAMS 47A55AMS 47B37Friedrichs, Kurt Otto40614Perturbation of spectra in Hilbert space /Kurt O. FriedrichsProvidence, R. I. :American Mathematical Society,1965xiii, 178 p. ;22 cm.Lectures in applied mathematics, ISSN 00758485 ;3Inner product spacesOperators on special spacesPerturbation theory.b1081849223-02-1728-06-02991001228209707536LE013 47A FRI11 (1965)12013000085784le013-E0.00-l- 02020.i1092527228-06-02Perturbation of spectra in Hilbert space81599UNISALENTOle01301-01-97ma -engus 01