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1、LectureNotesinMathematics1820Editors:J.--M.Morel,CachanF.Takens,GroningenB.Teissier,Paris3BerlinHeidelbergNewYorkHongKongLondonMilanParisTokyoFumioHiaiHidekiKosakiMeansofHilbertSpaceOperators13AuthorsFumioHiaiGraduateSchoolofInformationSciencesTohokuUniversityA
2、oba-ku,Sendai980-8579Japane-mail:hiai@math.is.tohoku.ac.jpHidekiKosakiGraduateSchoolofMathematicsKyushuUniversityHigashi-ku,Fukuoka812-8581Japane-mail:kosaki@math.kyushu-u.ac.jpCataloging-in-PublicationDataappliedforBibliographicinformationpublishedbyDieDeutsch
3、eBibliothekDieDeutscheBibliothekliststhispublicationintheDeutscheNationalbibliografie;detailedbibliographicdataisavailableintheInternetathttp://dnb.ddb.deMathematicsSubjectClassification(2000):47A30,47A64,15A60ISSN0075-8434ISBN3-540-40680-8Springer-VerlagBerlin
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6、ringer-VerlagBerlinHeidelbergNewYorkamemberofBertelsmannSpringerScience+BusinessMediaGmbHhttp://www.springer.decSpringer-VerlagBerlinHeidelberg2003PrintedinGermanyTheuseofgeneraldescriptivenames,registerednames,trademarks,etc.inthispublicationdoesnotimply,even
7、intheabsenceofaspecificstatement,thatsuchnamesareexemptfromtherelevantprotectivelawsandregulationsandthereforefreeforgeneraluse.Typesetting:Camera-readyTEXoutputbytheauthorSPIN:1094963441/3142/du-543210-Printedonacid-freepaperPrefaceRoughlyspeakingtwokindsofope
8、ratorand/ormatrixinequalitiesareknown,ofcoursewithmanyimportantexceptions.Operatorsadmitseveralnaturalnotionsoforders(suchaspositivesemidefinitenessorder,somemajorizationorde