简介:这份报纸证明每个非可分离的世袭地不能分解的Banach空格承认一个相等的严格地凸的标准,而是它的双性人鈥揹ual永远不能有如此的一个;因而,每非鈥搒e寓言世袭地不能分解的Banach空间没局部地有等价物一致地凸的标准。空格的关键词分解-世袭地不能分解的Banach空间-renormings先生(2000)题目分类46B20-46022研究由NSFC(资助号码10471114和号码10471025)支持了
简介:LetMbeaconvexChebyshevsubsetofauniformlyconvexanduniformlysmoothBanachspace.ItisprovedthatthemetricprojectionP_MofXontoMisuniformlycontinu-ousoneveryboundedsubsetofX.Moreover,aglobalandexplicitestimateonthemodulusofcontinuityofthemetricprojectionisobtained.
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简介:<正>Inthispaper,westudycompositionoperatorsonaBanachspaceofanalyticfunctions,denotedbyX,whichincludestheBlochspace.ThisspacearisesnaturallyasthedualspaceofanalyticfunctionsintheBergmanspaceL_a~1(D)whichadmitanatomicdecomposition.Wecharac-terizethefunctionswhichinducecompactcompositionoperatorsandthosewhichinduceFredholmoperatorsonthisspace.Wealsoinvestigatewhenacompositionoperatorhasaclosedrange.
简介:InthispaperitturnsoutthataBanachlatticeXisorderisomorphictol~1(Γ)forsomenonemptysetΓiffitisaSchurspaceandalltheinfinitelydimensional,separableandclosedidealsofXareorderisomorphic.
简介:LetEbeauniformlysmoothBanachspace,KbeanonemptyclosedconvexsubsetofE,andsuppose:T:K→Kisacontinuousφ-stronglypseudocontractiveoperatorwithaboundedrange.Usinganewanalyticalmethod,undergeneralcases,theIshikawaiterativeprocess{xn}convergesstronglytotheuniquefixedpointx*oftheoperatorTwereproved.Thepapergeneralizesandextendsalotofrecentcorrespondingresults.
简介:LetXbeacomplexBanachspacewithouttheanalyticRadon-Nikodymproperty.TheauthorshowsthatG={f∈H∞(D,X):thereexistse>0,suchthatforalmostallθ∈[0,2π],limsup‖f(rei)-f(sei)‖>∈}isadenseopensubsetofH(D,X).Itisalsoshownr,s↑1thatforeveryopensubsetBofT,thereexistsF∈H∞(D,X),suchthatFhasboundaryvalueseverywhereonBcandFhasradiallimitsnowhereonB.WhenAisameasurablesubsetofTwithpositivemeasure,thereexistsf∈H∞(D,X),suchthatfhasnontangentiallimitsalmosteyerywhereonAcandfhasradiallimitsalmostnowhereonA.
简介:超级哈雷的方法是为解决nonlnear方程的最好已知的第三顺序的重复之一。是这个方法的近似的一个像牛顿的方法被学习。我们的途径产出比它的古典前辈更有效的第四个R顺序反复的过程。我们用复发关系的一个新系统建立一条Newton-Kantorovich-type集中定理,并且给明确的表情为重复的priori错误界限。
简介:ThepaperisdevotedtotheasymptoticpropertiesoffunctionaldifferentialequationsinBanachspaces.Thecriteriaoftheinvariantandattractingsetsareobtained.Particularly,thesufficientconditionofasymptoticstabilityoftheequilibriumpointisgivenasthesystemhasanequilibriumpoint.Severalexamplesarealsoworkedouttodemonstratethevalidityoftheresults.
简介:§0.IntroductionLetXbearealseparableBanachspaceandX*beitsdualspace,LetB(X)betheBorelfield,i.e.,thetopologicalσ-field.Afunctionalu:X→R’iscalledaboundedsmoothfunctional,ifn∈N,f1,…,fn∈X*andφ∈Cb∞(Rn),suchthat
简介:LetCbeanonemptyboundedsubsetofap-uniformlyconvexBanachspaceX,andT={T(t):t∈S}beaLipschitziansemigrouponCwithliminf|||T(t)|||<Np,whereNpisn→∞t∈sthenormalstructurecoefficientofX.SupposealsothereexistsanonemptyboundedclosedconvexsubsetEofCwiththefollowingproperties:(P1)x∈Eimpliesωw(x)E;(P2)TisasymptoticallyregularonE.Theauthorsprovethatthereexistsaz∈EsuchthatT(s)z=zforalls∈S.Further,underthesimilarcondition,theexistenceoffixedpointsofLipschitziansemigroupsinauniformlyconvexBanachspaceisdiscussed.