共查询到20条相似文献,搜索用时 375 毫秒
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证明了AL-空间和Banach空间单位球面之间的满等距算子均可以延拓为全空间上的线性等距算子. 相似文献
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单位球面间的等距延拓 总被引:6,自引:6,他引:0
本文证明了在一定条件下赋范线性空间与其共轭空间的单位球面之间的等距算子可以延拓为全空间的实线性等距算子。进而,刻画了光滑的自反空间的单位球面到其共轭空间的单位球面上的等距算子。 相似文献
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研究赋范空间E和l~1(Γ)的单位球面之间的等距映射的延拓,得到E和l~1(Γ)的单位球面之间的满等距映射可以延拓为全空间E上的实线性等距算子,从而肯定地回答了相应的Tingley问题. 相似文献
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李磊 《数学物理学报(A辑)》2008,28(6):997-001
该文研究了实赋范空间的单位球面上的等距算子延拓问题. 为此, 作者定义一个新的空间E#, 称之为正齐性对偶空间, 并且研究了E#上的一个新的拓扑σ(E#, E). 从而, 作者就可以证明实赋范空间的单位球面上的一类满等距算子可以线性延拓到全空间上. 相似文献
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通过研究单位球面的几何性质,得到了赋β-范空间的单位球面上的等距算子可以延拓为全空间上的线性等距算子的几个充分条件,然后在赋β-范线性空间中推广了2-等距的概念,定义了(λ,κ,2)-等距和弱(λ,κ,2)-等距,并研究了它们的延拓问题,取得了一些新结果,这些结果是Song M.M.(2003)中的相应结果的推广. 相似文献
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本文证明了(l^βn)的单位球面间的非满等距在一定条件下可被线性等距延拓至全空间。并刻画了l^p(P〉0)上的非满渐进可乘等距算子. 相似文献
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首先给出了两个实的l~∞-类型空间单位球面之间满等距映射的表现定理,然后得出上述映射是可以延拓成为全空间上的(实)线性等距算子. 相似文献
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刘锐 《数学物理学报(A辑)》2007,(3)
该文给出了单位球面间等距算子在非满情况下的一些性质,以及在这种情况下算子值域空间的一些结构特征,并由此得出从c_0(Γ)到■~∞-空间单位球面之间非满等距算子能够延拓的充要条件。 相似文献
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We study the spaces of left-invariant Riemannian metrics on a Lie group up to isometry, and up to isometry and scaling. In this paper, we see that such spaces can be identified with the orbit spaces of certain isometric actions on noncompact symmetric spaces. We also study some Lie groups whose spaces of left-invariant metrics up to isometry and scaling are small. 相似文献
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AbstractIn various normed spaces we answer the question of when a given isometry is a square of some isometry. In particular, we consider (real and complex) matrix spaces equipped with unitarily invariant norms and unitary congruence invariant norms, as well as some infinite dimensional spaces illustrating the difference between finite and infinite dimensions. 相似文献
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Bogdana Oliynyk 《Central European Journal of Mathematics》2013,11(2):264-273
We consider isometry groups of a fairly general class of non standard products of metric spaces. We present sufficient conditions under which the isometry group of a non standard product of metric spaces splits as a permutation group into direct or wreath product of isometry groups of some metric spaces. 相似文献
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In this paper we examine the properties of EC-plastic metric spaces, spaces which have the property that any noncontractive bijection from the space onto itself must be an isometry. 相似文献
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In this paper, we investigate isometric extension problem in general normed space. We prove that an isometry between spheres can be extended to a linear isometry between the spaces if and only if the natural positive homogeneous extension is additive on spheres. Moreover, this conclusion still holds provided that the additivity holds on a restricted domain of spheres. 相似文献
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The classical Mazur–Ulam theorem which states that every surjective isometry between real normed spaces is affine is not valid for non-Archimedean normed spaces. In this paper, we establish a Mazur–Ulam theorem in the non-Archimedean strictly convex normed spaces. 相似文献