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.
简介:研究了严格凸Banach空间中非空间凸子集上拟非扩展映象的不动点的迭代逼近问题,主要证明了:设E是严格凸Banach空间,K为E的闭凸子集,T:K→K为连续拟非扩展映象.进一步假设T(K)包含于K的一个紧子集之中,迭代地定义序列{xn}∞n=1如下:(IS)yn=(1-βn)xn+βnTxn,n≥1,xn+1=(1-αn)xn+αnTyn,n≥1,其中{αn}和{βn}满足一定的条件,则{xn}强收敛于T的某个不动点.
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:把Banach空间上向量测度理论中的Vitali—Hahn—Saks—Nikodym定理推广到了更一般的局部凸空间上.进而给出局部凸空间上强可加向量测度列与一致强可加测度列的关系.
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:Utilizingthestabilitycharacterizationsofgeneralizedinversesoflinearoperator,weinvestigatetheexistenceofgeneralizedresolventoflinearpencilsinBanachspaces.Somepracticalcriterionsfortheexistenceofgeneralizedresolventsofthelinearpencilλ→TλSareprovidedandanexplicitexpressionofthegeneralizedresolventisalsogiven.Asapplications,thecharacterizationfortheMoore-Penroseinverseofthelinearpenciltobeitsgeneralizedresolventandtheexistenceofthegeneralizedresolventsoflinearpencilsoffiniterankoperators,Fredholmoperatorsandsemi-Fredholmoperatorsarealsoconsidered.Theresultsobtainedinthispaperextendandimprovemanyresultsinthisarea.
简介:InthispaperitturnsoutthataBanachlatticeXisorderisomorphictol~1(Γ)forsomenonemptysetΓiffitisaSchurspaceandalltheinfinitelydimensional,separableandclosedidealsofXareorderisomorphic.
简介:LetEbeauniformlysmoothBanachspace,KbeanonemptyclosedconvexsubsetofE,andsuppose:T:K→Kisacontinuousφ-stronglypseudocontractiveoperatorwithaboundedrange.Usinganewanalyticalmethod,undergeneralcases,theIshikawaiterativeprocess{xn}convergesstronglytotheuniquefixedpointx*oftheoperatorTwereproved.Thepapergeneralizesandextendsalotofrecentcorrespondingresults.