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185 个结果
  • 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

  • 标签: 空间分解 遗传非分解性Banach空间 凸模 数学分析
  • 简介:让并且吗?是Banach代数学。让吗?是Banach与围住1。当时是有平常的操作和标准的Banach代数学。如此的代数学被称为三角形的Banach代数学。在这份报纸,三角形的Banach代数学的等轴的同晶型被描绘。

  • 标签: 等距同构 三角形 巴拿赫代数 特征值
  • 简介:LetMbeaconvexChebyshevsubsetofauniformlyconvexanduniformlysmoothBanachspace.ItisprovedthatthemetricprojectionP_MofXontoMisuniformlycontinu-ousoneveryboundedsubsetofX.Moreover,aglobalandexplicitestimateonthemodulusofcontinuityofthemetricprojectionisobtained.

  • 标签: projection CHEBYSHEV UNIFORMLY CONVEX SUBSET SMOOTHNESS
  • 简介:<正>Inthispaper,westudycompositionoperatorsonaBanachspaceofanalyticfunctions,denotedbyX,whichincludestheBlochspace.ThisspacearisesnaturallyasthedualspaceofanalyticfunctionsintheBergmanspaceL_a~1(D)whichadmitanatomicdecomposition.Wecharac-terizethefunctionswhichinducecompactcompositionoperatorsandthosewhichinduceFredholmoperatorsonthisspace.Wealsoinvestigatewhenacompositionoperatorhasaclosedrange.

  • 标签: BERGMAN space Composition OPERATOR COMPACT OPERATOR
  • 简介:Utilizingthestabilitycharacterizationsofgeneralizedinversesoflinearoperator,weinvestigatetheexistenceofgeneralizedresolventoflinearpencilsinBanachspaces.Somepracticalcriterionsfortheexistenceofgeneralizedresolventsofthelinearpencilλ→TλSareprovidedandanexplicitexpressionofthegeneralizedresolventisalsogiven.Asapplications,thecharacterizationfortheMoore-Penroseinverseofthelinearpenciltobeitsgeneralizedresolventandtheexistenceofthegeneralizedresolventsoflinearpencilsoffiniterankoperators,Fredholmoperatorsandsemi-Fredholmoperatorsarealsoconsidered.Theresultsobtainedinthispaperextendandimprovemanyresultsinthisarea.

  • 标签: Banach空间 算子广义逆 中线性 半FREDHOLM算子 MOORE-PENROSE逆 铅笔
  • 简介:InthispaperitturnsoutthataBanachlatticeXisorderisomorphictol~1(Γ)forsomenonemptysetΓiffitisaSchurspaceandalltheinfinitelydimensional,separableandclosedidealsofXareorderisomorphic.

  • 标签: ISOMORPHIC nonempty INFINITELY SEPARABLE proof TURNS
  • 简介:LetEbeauniformlysmoothBanachspace,KbeanonemptyclosedconvexsubsetofE,andsuppose:T:K→Kisacontinuousφ-stronglypseudocontractiveoperatorwithaboundedrange.Usinganewanalyticalmethod,undergeneralcases,theIshikawaiterativeprocess{xn}convergesstronglytotheuniquefixedpointx*oftheoperatorTwereproved.Thepapergeneralizesandextendsalotofrecentcorrespondingresults.

  • 标签: ISHIKAWA ITERATIVE process φ-stongly pseudocontractive operators
  • 简介:<正>ForanoperatorweightedshiftS,theessentialspectrumσ_e(S)andtheindicesassociatedwithholesinσ_e(S)aredescribed.Moreover,BanachreducibilityofSisinvestigatedandaconditionforS~*tobeaCowen-Douglasoperatorischaracterized.

  • 标签: OPERATOR WEIGHTED SHIFT Essential SPECTRUM BANACH
  • 简介:Hahn-Banach定理,作为泛函分析三大基本定理之一应用广泛.本文介绍该定理的内容,并初步探讨其推论及其在泛函的延拓的应用.

  • 标签: HAHN-BANACH定理 泛函分析 延拓 应用
  • 简介:在这篇文章,在Banach空格为的概括Roper鈥擲uffridge延期操作员局部地,biholomorphicmappings被介绍。这个操作符在Banach空格在一些域上保存星形,但是不为一些盒子保存凸状,这被证明。而且,星形的生长定理,盖住的定理,和半径被讨论。格雷厄姆Roper和Suffridge,铜锣和刘的一些结果在Cn的等被扩大到Hilbert空格或Banach空格。

  • 标签: 巴拿赫空间 双全纯凸映射 双全纯拟星形映射 扩展算子
  • 简介:本文研究了有界相容不变性的问题.利用局部收敛的概念,给出了线性拓扑Tb的一些性质,由此获得了Banach-Mackey性质的若干新特征.

  • 标签: 有界相容 Banach-Mackey空间 局部完备
  • 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.

  • 标签: 存在性 径向极限 BANACH空间 解析函数
  • 简介:研究了Banach空间Xμ={c=(ci)i≥1:||c||μ====def(^∞∑i=1)iμ|ci|∞},μ≥1,讨论了它的范数,紧性以及强收敛和弱收敛之间的关系.

  • 标签: BANACH空间 紧性 强收敛 弱收敛