共查询到19条相似文献,搜索用时 78 毫秒
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本文利用序列覆盖分层强紧映射,建立了( )-空间,g-可度量空间与特定的度量空间的关系,这是对Alexandroff的部分问题的肯定回答。 相似文献
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本文利用序列覆盖分层强紧映射,建立了Ν-空间,g-可度量空间与特定的度量空间的关系,这是对Alexandroff的部分问题的肯定回答. 相似文献
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The main purpose of this paper is to establish the mapping relation between metric spaces and sn-metric spaces. 相似文献
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关于局部紧度量空间的映象 总被引:8,自引:0,他引:8
本文借助于商映射、伪开映射和闭映射建立局部紧度量空间和几类具有某些特定性质mk-系之间的联系,作为推论.得到:双商ss-映射保持局部紧度量空间. 相似文献
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CWC映射和度量化定理 总被引:1,自引:0,他引:1
利用CWC映射,本文获得了对称度量空间和g可度量空间的特征,建立了几个度量化定理,改进了一些已知结果.主要的定理是证明正则空间X是可度量化空间当且仅当存在X上的CWC映射g满足如下条件: (Ⅰ)若序列{xn}和{yn}对于每一n∈N有xn∈g(n,yn)且xn→x,则yn→x.(Ⅱ)若序列{xn}和{yn}对于每一n∈N有yn∈g(n,yn)且xn→x,则yn→x. 相似文献
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In this paper,we introduce the concepts of I-covering mappings and 1-I-covering mappings,discuss the difference between sequence-covering and I-covering mappings by some examples.With those concepts,we get some interesting properties of I-covering(1-I-covering)mappings and some characterizations of I-covering(1-I-covering)and compact mapping images of metric spaces. 相似文献
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We show that a quasiconformal mapping between two proper, locally Ahlfors Q-regular metric spaces, Q > 1, is absolutely continuous on almost every curve. We further relax the limes superior in the definition of quasiconformality
to a limes inferior and verify that exceptional sets analogous to the Euclidean setting can be allowed.
The authors were supported by grants from the Swiss NSF and the Academy of Finland. Part of the research was done while S.R.
was visiting at the University of Bern.
Received: August 2005 Accepted: January 2006 相似文献
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若记B^n为C^n中的单位球,本文研究B^n上的强拟凸映强,(1)强拟凸映照与星形映照及凸映照的关系,(2)强拟凸映照的二次项系;(3)单位多圆柱上的强拟凸映照。 相似文献
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In this paper we define two classes of quasiconformal mappings,and study their covering properties by methods of module.We obtain some new results.In the meantime,we give new methods to prove Koebe 1/2 covering theorem on convex conformal mappings. 相似文献
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§ 1. Introduction Theconvexfunctionshavebeenextensivelystudiedinonecomplexvariable .Thesefunc tionsareeasilycharacterizedbysimpleanalyticorgeometricconditionsandtherearemanywellknownresultswhichcanhelpusunderstandtheirnature.However,thedifficultiesariseinsev eralcomplexvariables.Imposingtheconditionthatamappingbeconvexmappingturnsouttobeveryrestrictiveandsothefamilyofquasi convexmappingswasintroducedbyROPERKAandSUFFRIDGETJin [1 ].In [2 ]wehaveshown :thefamilyofquasi convexmappings… 相似文献