赋范锥到赋范线性空间的嵌入定理与赋范锥上的Hahn-Banach定理

研究赋范锥到赋范线性空间的嵌入问题与赋范锥上连续线性泛函的Hahn-Banach正延拓问题.第一部分采用几何方法直接证明赋范锥到赋范线性空间的嵌入定理.对于给定的赋范线性空间中的凸锥,通过引进凸锥的"锐性模".第二部分研究由锥范数导出的延拓范数与原范数的等价关系.第三部分给出赋范锥上连续线性泛函的Hahn-Banach正延拓定理.     

赋准范空间之间线性算子的五种有界性与连续性

综合散见于多种文献的不同描述,明确线性算子拓扑有界、邻域有界、范有界与强有界的定义,引进次强有界的概念,给出赋准范空间之间与赋β-范空间之间线性算子的各种有界性以及连续性之间的关系定理与反例.     

概率度量空间中的拓朴度理论与不动点定理*

在本文中我们在概率线性赋范空间中建立了Leray-Schauder度理论.并以此为工具得出了概率线性赋范空间中的某些不动点定理.     

模糊赋范线性空间中准齐性算子族的等度连续性

在模糊赋范线性空间中研究点态模糊有界的准齐性算子族的等度连续性, 并且建立点态模糊半有界与点态非模糊无界的准齐性算子族的共鸣定理.作为其推论, 得到了经典的赋范线性空间和Menger概率赋范线性空间中相应的结论.     

随机赋范空间中算子随机范数与共鸣定理及应用

基于概率论理论基础,给出了随机赋范空间中算子的随机范数定义,在此基础上,应用逆算子定理证明了随机赋范空间中算子族的共鸣定理,它以Banach空间中的共鸣定理为特例,是Banach空间中的共鸣定理的随机化形式,随机化的共鸣定理刻划了在随机赋范空间框架下随机变量族的一致有界性.随机赋范空间中的共鸣定理将可能成为随机泛函分析与概率论的新应用工具.     

非局部凸拓扑线性空间中的Hahn Banach延拓性

1 序 众所周知,Hahn(1926)和Banach(1929)曾经在赋范空间中给出过一个十分重要的有关连续线性泛函的延拓定理: H.-B.定理 设X为赋范空间,X_0为X的一个线性子空间,那么,对任意连续线性泛函     

模糊赋范线性空间的紧性与完备性

讨论了Fuzzy赋范线性中准紧集、完备集及有界集间的关系;给出完备Fuzzy赋范空间的闭球套定理与Baire定理;刻画了了有限维Fuzzy赋范空间的特征。     

算子概率范数与共鸣定理

提出概率赋范线性空间上集合有界性的简化定义,利用算子概率范数概念。进一步研究概率赋范线性空间上的线性算子理论,并在算子概率赋范空间上,建立了概率有界、概率半有界、非概率无界意义下的共鸣定理。     

Lagrange中值定理在线性赋范空间中推广的一个初等证明

本文将古典微积分中的Lagrange中值定理用初等的方法推广到线性赋范空间,为此,引进有关定义与引理,然后给出线性赋范空间中的微分中值定理及其推论。     

凸泛函型的区域压缩与拉伸不动点定理

利用赋范线性空间中的收缩核,给出了凸泛函型的区域压缩与拉伸不动点定理,推广了郭大钧定理.     

Some fixed point theorems in fuzzy reflexive Banach spaces

In this paper, we first show that there are some gaps in the fixed point theorems for fuzzy non-expansive mappings which are proved by Bag and Samanta, in [Bag T, Samanta SK. Fixed point theorems on fuzzy normed linear spaces. Inf Sci 2006;176:2910–31; Bag T, Samanta SK. Some fixed point theorems in fuzzy normed linear spaces. Inform Sci 2007;177(3):3271–89]. By introducing the notion of fuzzy and α- fuzzy reflexive Banach spaces, we obtain some results which help us to establish the correct version of fuzzy fixed point theorems. Second, by applying Theorem 3.3 of Sadeqi and Solati kia [Sadeqi I, Solati kia F. Fuzzy normed linear space and it’s topological structure. Chaos, Solitons & Fractals, in press] which says that any fuzzy normed linear space is also a topological vector space, we show that all topological version of fixed point theorems do hold in fuzzy normed linear spaces.     

Linear operators in finite dimensional probabilistic normed spaces

In this paper, we consider strongly bounded linear operators on a finite dimensional probabilistic normed space and define the topological isomorphism between probabilistic normed spaces. Then we prove that every finite dimensional probabilistic normed space which is a topological vector space is complete.     

A new type of orthogonality for normed planes

In this paper we introduce a new type of orthogonality for real normed planes which coincides with usual orthogonality in the Euclidean situation. With the help of this type of orthogonality we derive several characterizations of the Euclidean plane among all normed planes, all of them yielding also characteristic properties of inner product spaces among real normed linear spaces of dimensions d ⩾ 3.     

An orthogonality in normed linear spaces based on angular distance inequality

In this paper, we present a new orthogonality in a normed linear space which is based on an angular distance inequality. Some properties of this orthogonality are discussed. We also find a new approach to the Singer orthogonality in terms of an angular distance inequality. Some related geometric properties of normed linear spaces are discussed. Finally a characterization of inner product spaces is obtained.     

赋范线性空间中的列收敛

本文证明了Ｓｃｈｕｒ空间与有限维Ｂａｎａｃｈ空间的两个特征定理，并对赋范线性空间中的列收敛进行了讨论，得到了一些有趣的结果。     

Random strict convexity and random uniform convexity in random normed modules

Based on the analysis of stratification structure on random normed modules, we first present random strict convexity and random uniform convexity in random normed modules. Then, we establish their respective relations to classical strict and uniform convexity: in the process some known important results concerning strict convexity and uniform convexity of Lebesgue-Bochner function spaces can be obtained as a special case of our results. Further, we also give their important applications to the theory of random conjugate spaces as well as best approximation. Finally, we conclude this paper with some remarks showing that the study of geometry of random normed modules will also motivate the further study of geometry of probabilistic normed spaces.     

Linear regularity and ?-regularity of nonconvex sets

In this paper, we discuss some sufficient conditions for the linear regularity and bounded linear regularity (and their variations) of finitely many closed (not necessarily convex) sets in a normed vector space. The accompanying necessary conditions are also given in the setting of Asplund spaces.     

Module Homomorphisms on Random Normed Modules

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On orthocomplemented subspaces in p-adic Banach spaces

For linear subspaces of finite-dimensional normed spaces over K, where K is a non-Archimedean complete valued field which is not spherically complete, we study orthocomplementation as related to strictness and the Hahn-Banach property. We prove that there exist finite-dimensional normed spaces which possess non-orthocomplemented, strict HB-subspaces.