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1、分類號(hào)密級學(xué)號(hào)0177123471■一碩十學(xué)位論文題目差王旦(H)上線性堡掛噠射羞王聞?lì)}的硒窒作者王琳琳指導(dǎo)教師盎國羞耋絲學(xué)科專業(yè)垂壟塹生提交B期三QQ查生至旦ResearchonLinearPreservingMappingswhichareonz3(n)Lin—linWangAbstract:Thestudyofoperatoralgebratheorybeganin30timesofthe20thcenturyWiththefas

2、tdevelopmentofthetheory)nowithasbecomeahotbranchplayingtheroleofauinitiatorinmodernmathematicsIthasunexpectedrelationsandinterin矗ltrationswithquantummechanics,noncommutativegeometry1inearsystemandcontroltheoryindeednumbe

3、rtheoryaswellassomeotherimportantbranchesofmathematicsInordertodiscussthestructureofoperatoralgebrasjnrecentyears,manyscholarsbothhereandabroadhavefocusedonlinearpreservingmappingsonoperatoralgebrasandhaveintroducedmorea

4、ndmorenewmethodsThepreservingproblemouoperatoralgebraistoresearchsonicmappingsthatpreservecharacterizationonoperatoralgebraOnthebasisofexistingpapers,inthispaperwemainlyanddetailedlydiscusslinearboundedsurgectionsthatpre

5、servequasisimilarity,andelementaryoperatorsoflength1and2thatpreserveunitarysimilarityThispapercontainsthreechapters:Chapter1mainlyintroducessomenotations,definitionsandsomewell—knowntheoremsaregivenFirstly】wegivesomenota

6、tionsSubsequentlyweintroducethedefinationsofspectrum,similarity,quasisimilarity,Unitarysimilarity,andelemen—taryoperatorsetcFinallywegivesomewell—knowntheoremsInchapter2,wediscussboundedlinearmappingsthatpreservequasisim

7、ilarityLet7/beaseparableinfinitedimensionalHilbertspaceand8f爿)theBanachalgebraofallboundedlinearoperatorson州In『11,authorsresearchedthelinearmappingsthatarepreserveSimilarityininfinitedimensionTheycharacteredtheboundedlin

8、earsurjectionsonB(H)thatpreservesimilarityinbothdirectionsbycharacter’izingthesimilarityinvariantsubspacesof8㈣)In吼authorcharaeteredboundedlinearsurjectionsons(n)thatpreserveasymptopicalsimilarityInthischapter,let咒beasepa

9、rableinfinitedimensionalHilbertspaceamdB(H)theBanachalgebraofallboundedlinearoperatorson7/westudythequasisimilarity—invariantsubspacesof廖㈣)andquasisimilarity—preservinglinearmapson舀(州)Inthischapter、itisprovedthatthequasi

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