锥超度量空间的不动点理论

给出了锥超度量空间与锥度量空间上Hausdorff度量的定义.并利用球完备的性质在锥超度量空间上证明了有关收缩映射与多值映射的不动点理论.     

G-锥度量空间中压缩映射的不动点定理

给出了G-锥度量空间的概念,利用迭代法探究了G-锥度量空间中压缩映射不动点定理,证明了在G-锥度量空间中锥没有正规性的条件下压缩映射存在唯一不动点.     

巴拿赫代数上锥b-度量空间中压缩映射不动点定理

在对巴拿赫代数上的锥度量空间的压缩条件研究的基础上,运用迭代和限制谱半径的方法,证明了巴拿赫代数上的锥b-度量空间的压缩映射不动点定理,将锥度量空间的压缩条件推广到巴拿赫代数上的锥b-度量空间中.     

锥b-度量空间上映射的公共不动点定理

本文研究了锥b-度量空间上四个自映射的公共不动点问题.利用序列逼近的方法,获得了锥b-度量空间上四个自映射的一些公共不动点结果,将锥度量空间中的几个相关结果推广到锥b-度量空间中,并且给出了一个例子以支撑我们的结果.     

锥b-度量空间上映射的公共不动点定理（英文）

本文研究了锥b-度量空间上四个自映射的公共不动点问题.利用序列逼近的方法,获得了锥b-度量空间上四个自映射的一些公共不动点结果,将锥度量空间中的几个相关结果推广到锥b-度量空间中,并且给出了一个例子以支撑我们的结果.     

动力系统在链回复集上的拓扑稳定性

本文证明, 紧度量空间上的同胚, 若在链回复集上可扩且具有伪轨跟踪性, 则是链拓扑稳定的.     

锥度量空间中锥的非正规性条件(英文)

该文首先给出锥度量空间中的锥为非正规锥的几个充要条件,随后给出一个例子进行验证.并且在锥度量空间中,当不考虑空间的完备性时,在压缩映射条件下,得到非正规锥的存在性.这些结果直接改进前人关于度量空间的一些结果,也补充他们关于锥度量空间的一些结果.     

TVS-锥度量空间中扩张映射的不动点定理

在TVS-锥度量空间概念的基础上,建立了TVS-锥度量空间的若干理论,并运用这些理论,对满足不同条件的扩张型映射,采用不同的迭代方法,得到了TVS-锥度量空间中扩张映射新的不动点定理,结果是度量空间中某些经典结果在锥度量空间的进一步推广和发展.     

TVS-锥度量空间中扩张映射的公共不动点

在完备的TVS-锥度量空间中研究了经典的扩张型映射的公共不动点的存在性及唯一性,所得结果推广了一些已知的重要结论,将扩张映射公共不动点的研究从锥度量空间(Banach-锥)发展到TVS-锥度量空间.     

一类新型$\alpha$-可容许映射及相关公共不动点定理

本文定义一种向量版本的三角型 $\alpha$-可容许映射, 在没有利用锥的正规性条件下, 得到赋值Banach代数的锥度量空间中的带有三角型 $\alpha$-admissible映射的几种压缩映射的公共不动点定理, 所给出的结论进一步改进了前人的一些结果.     

周期吸附系统的分布混沌

由一个紧致度量空间X以及连续映射f:X→X所组成的偶对(X,f)称之为一个动力系统.若存在f的不动点p以及另一周期点q,使得对于任一非空开集U(?)X,都有∪_(n=0)~∞f~n(U)含有p和q,则称(X,f)是一个周期吸附系统,其中f~i表示f的i次迭代.本文指出:若(X,f)是一个周期吸附系统并且X是自密的,则存在一个f的分布混沌集D,使得D与每一非空开集之交都包含着一个Cantor集.     

Some relations between Hausdorff-dimensions and entropies

Some relations between the Hausdorff-dimensions and the entropies for expansive homeomorphisms on compact metric spaces are obtained. Project partially supported by the National Natural Science Foundation of China.     

图上Z~2可扩作用的非存在性

文[9]中作者考虑连续统上可扩群作用的存在性问题,证明了单位闭区间上不存在自由交换群Z×Z的可扩作用,并且给出一个例子表明闭区间上存在自由积Z*Z的可扩作用.换句话说,由两个交换同胚生成的群是不能可扩作用在闭区间上的,但还是存在由两个非交换同胚生成的群能够可扩作用在闭区间上.本文证明了图上不存在Z×Z的可扩作用,解决了文[9]所提的一个问题.     

Positively expansive dynamical systems

We introduce the notions of weakly and strongly positively expansive (wPE and sPE, respectively) discrete dynamical systems. Both are topological generalizations of the well-known metric notion of positive expansiveness (PE). We prove that the three notions are identical on compact metrizable spaces, but not on noncompact spaces. We investigate properties of PE, wPE, and sPE dynamical systems and show how they are related. Finally, we show that the possible dynamics for wPE and sPE homeomorphisms are severely limited, and we classify sPE homeomorphisms.     

Some Remarks on Perov Type Mappings in Cone Metric Spaces

Let \(\left( E,C,t\right) \) be a real ordered topological vector space and let (X, d) be a tvs-cone metric space over cone C. Using Proposition 19.9 of Deimling (Nonlinear functional analysis, Springer, Berlin, 1985), we show that E can be equipped with a norm such that C is a normal monotone solid cone. Hence, a tvs-cone metric space \(\left( X,d\right) \) over a solid cone C is a normal cone metric space over the same cone C. This assures that tvs-cone metric spaces are not a genuine generalization of cone metric spaces introduced by Huang and Zhang, recently. Further, if the cone C is solid then we have only cone metric spaces over normal solid cone (with coefficient of normality \(K=1\)). Here, we introduce also the notion of Sehgal–Guseman–Perov type mappings and we establish a result of existence and uniqueness of fixed points for this class of mappings.     

Dendrite上可扩Z~2作用的非存在性

1990年,Kato证明了Dendrite上不存在可扩同胚．本文证明了Dendrite上不存在可扩Z2作用．该结果回答了作者所提的一个问题,也推广了Kato的上述结论．     

A note on Stone’s,Baire’s,Ky Fan’s and Dugundji’s theorem in tvs-cone metric spaces

Recently, Ayse Sonmez [A. Sonmez, On paracompactness in cone metric spaces, Appl. Math. Lett. 23 (2010) 494–497] proved that a cone metric space is paracompact when the underlying cone is normal. Also, very recently, Kieu Phuong Chi and Tran Van An [K.P. Chi, T. Van An, Dugundji’s theorem for cone metric spaces, Appl. Math. Lett. (2010) doi:10.1016/j.aml.2010.10.034] proved Dugundji’s extension theorem for the normal cone metric space. The aim of this paper is to prove this in the frame of the tvs-cone spaces in which the cone does not need to be normal. Examples are given to illustrate the results.     

On Hermite-Hadamard-type characterizations of higher-order differential inequalities

Let $I$ be an open interval of $\mathbb{R}$ and $f: I\to \mathbb{R}$. It is well-known that $f$ is convex in $I$ if and only if, for all $x,y\in I$ with $x相似文献   

涉及分担集的整函数的唯一性

In this paper,uniqueness of entire function related to shared set is studied.Let f be a non-constant entire function and k be a positive integer,d be a finite complex number.There exists a set S with 3 elements such that if f and its derivative f（k）satisfy E（S,f）= E（S,f（k））,and the zeros of f（z）-d are of multiplicity ≥ k ＋ 1,then f = f（k）.     

Wavelet sets in ℝ n

A congruency theorem is proven for an ordered pair of groups of homeomorphisms of a metric space satisfying an abstract dilation-translation relationship. A corollary is the existence of wavelet sets, and hence of single-function wavelets, for arbitrary expansive matrix dilations on L ² (ℝ ⁿ). Moreover, for any expansive matrix dilation, it is proven that there are sufficiently many wavelet sets to generate the Borel structure ofℝ ⁿ. The second author is supported in part by NSF Grant DMS-9401544. The third author was a Graduate Research Assistant at Workshop in Linear Analysis and Probability, Texas A&M University.