Uniform Convexity in Nonsymmetric Spaces

Mathematical Notes - Uniformly convex asymmetric spaces are defined. It is proved that every nonempty closed convex set in a uniformly convex complete asymmetric space is a set of approximative...     

线性距离空间的一致凸性与自反性

本文研究了线性距离空间的一致凸性与自反性，同时对吴从Ｘｉｎ等提出的严格缩条件能否去掉的问题给出了肯定的答案。     

一致凸度量线性空间的自反性及其应用

为研究度量线性空间中凸集的逼近性质，Ｇ．Ｃ．Ａｈｕｊａ等引起了度量线性空间的严格凸性及一致凸性的定义。本文证明了完备的一致凸的度量线性空间是自反的。同时，作为应用，研究了最佳联合逼近元的存在性与唯一性问题。     

关于随机一致凸性

致力于随机一致凸性概念的进一步探讨．首先,通过一个特殊的层次剖分指出对任意的随机赋范模而言随机凸性模都有良好定义,从而改进了近期的文献中许多已知的结果．然后,提出并研究了一种与随机一致凸性密切相关的新性质,从一个新的角度阐述了随机一致凸性的复杂性．     

k—严格凸与k—UR空间

本文讨论k—严格凸Banach空间的各种性质,并证明,对于有限维空间,k—严格凸与k—UR是等价的.另外若x,Y分别是k₁—严格凸k₂—严格凸的Banach空间,11+k₂-1)—严格凸的Banach空间.     

Polynomial Convexity of Teichmuller Spaces

It is well known that finite-dimensional Teichmüller spacesare holomorphically convex, that is, they are domains of holomorphy.Moreover, the holomorphic convexity is fulfilled for all Teichmüllerspaces in a stronger form: they are complex hyperconvex. In this note we establish that, in fact, finite-dimensionalTeichmüller spaces possess a much stronger convexity property,namely, they are polynomially convex; in other words, they areRunge domains. Additionally, some geometric properties of Teichmüllerspaces are established.     

On Pointwise Uniform and Locally Uniform Spaces

ＯｎＰｏｉｎｔｗｉｓｅＵｎｉｆｏｒｍａｎｄＬｏｃａｌｌｙＵｎｉｆｏｒｍＳｐａｃｅｓＧａｏＹｕｎｐｅｎｇ（高云鹏）（ＤｅｐａｒｔｍｅｎｔｏｆＭａｔｈｅｍａｔｉｃｓ，ＨａｒｂｉｎＮｏｒｍａｌＵｎｉｖｅｒｓｉｔｙ，Ｈａｒｂｉｎ，Ｈａｒｂｉｎ，１５０００１）...     

L-不分明化一致空间和L-不分明化一致拓扑

通过应用完全剩余格值逻辑语义的方法把不分明化一致空间和不分明化一致拓扑推广为L-不分明化一致空间和L-不分明化一致拓扑。并且讨论了L-不分明化一致空间和L-不分明化一致拓扑的一些基本性质。     

概率赋范空间中的一致凸性

该文在概率赋范空间中引进了“单位球”和“一致凸”的概念,证明了“最佳近似元”的存在性和唯一性。     

Banach空间上凸集的凸性

以Banach空间的一般凸集为研究对象,将Banach空间的凸性研究推广到了内部非空的凸集上．打破了从单位球出发研究Banach空间几何的具有局限性的研究方法,给出了严格凸集的若干特征刻画及性质,并得到了严格凸集和光滑集之间的对偶定理．     

局部凸空间的K强凸性与K强光滑性

首先引进了局部凸空间K强凸性的概念,它既是Banach空间K强凸性概念在局部凸空间中的推广,又是局部凸空间强凸性概念的自然推广;其次给出了局部凸空间K强凸性概念的对偶概念,即局部凸空间K强光滑性的概念,并得到了K强凸(K强光滑)的局部凸空间的特征刻画;最后,在P-自反的条件下给出了它们之间的对偶定理,即(X,TP)是K强凸(K强光滑)的当且仅当(X′,TP′)是K强光滑(K强凸)的.     

Real Interpolation for Families of Banach Spaces and Convexity

We show how the geometrical properties of uniform convexity and uniformly non-?? are inherited by real interpolation spaces for infinite families.     

关于Banach空间k一致凸及k一致光滑性

用统一且简洁形式刻画、定义了Banach空间的(局部)k一致凸、k-强凸、ω-强凸性.给出(局部)k一致光滑性概念,并讨论了上述空间的关系及性质.     

Bergman空间上Toeplitz算子的凸性

本文讨论了Ｂｅｒｇｍａｎ空间上Ｔｏｅｐｌｉｔｚ算子的凸性，证明了具有调和符号和一类连续函数符号的Ｔｏｅｐｌｉｔｚ算子是凸型算子，并举例说明，存在具有连续函数符号的非凸型Ｔｏｅｐｌｉｔｚ算子。     

Completion of Probabilistic Uniform Limit Spaces

In this article completions of special probabilistic semiuniform convergence spaces are considered. It turns out that every probabilitic Cauchy space under a given t-norm T (triangular norm) has a completion which, in the special case of probabilistic Cauchy spaces with reference to T=min, coincides with the KentRichardson completion for probabilistic Cauchy spaces. Moreover, a completion of probabilistic uniform limit spaces wrt T=min is given which in case of constant probabilistic uniform limit spaces coincides with the Wyler completion.     

关于超一致空间的一个注记

最近,张德学引入了拓扑构造的co-tower扩张这一概念,并证明了不分明拓扑学中若干熟知的范畴构造可以表示为较为简单的范畴构造的co-tower扩张.本文证明了由J.GutiérrezGarcía和M.A.dePradaVicente[3]引入的超一致空间构造SUS具体同构与R.Lowen[9]意义下的不分明一致空间构造FUS的cco-tower扩张的一个满子构造,而已知FUS同构于一致空间构造的co-tower扩张.     

Orlicz-Lorentz空间的局部一致凸

本文证明了Orlicz-Lorentz空间Λ，w局部一致凸的充要条件为：（i）△2，（ii）是严格凸的，（iii）W（l）＞0，l（0，γ），γ＜∞     

A Generalization of Probabilistic Uniform Spaces

We develop a theory for probabilistic semiuniform convergence spaces. Probabilistic semiuniform convergence spaces generalize probabilistic uniform spaces in the sense of Florescu and probabilistic convergence spaces in the sense of Kent and Richardson. This theory includes a new branch in topology, namely, Convenient Topology, introduced by Preuß. Thus, it includes semiuniform convergence spaces and uniform spaces, filter and Cauchy spaces and (symmetric) limit spaces and, therefore, (symmetric) topological spaces. The theory of probabilistic semiuniform convergence spaces reveals categories which are strong topological universes or have other convenient properties.