关于子空间的超空间拓扑

For a topological space X we denote by CL(X) the collection of all nonempty closed subsets of X. Suppose we have a map T which assigns in some coherent way to every topological space X some topology T(X) on CL(X). In this paper we study continuity and inverse continuity of the map iA,X : (CL(A), T(A))→(CL(X),T(X)) defined by iA,x(F) = ^-F whenever F ∈ CL(A), for various assignment T; in particular, for locally finite topology, upper Kuratowski topology, and Attouch-Wets topology, etc.     

关于某些拟一致空间的超空间拓扑

设(X,τ)是一个拓扑空间。在本文中,我们证明了在超空间2^X上局部有限拓扑e^τ与局部有限覆盖拟一致u_LF所导出的超拓扑|2^u_LF|是相同的。我们还证明了下面条件是等价的:(1)(X,τ)是仿紧的;(2)(X,τ)是orth紧的,且e^τ=|2^u_FT|;(3)存在一个Lebes-yue拟一致u_L,使e^τ<     

一类集值映射的传递性、混合性与混沌

考虑连续映射f: X→X以及f诱导的K(X)到自身的连续映射, 其中X为度量空间, K(X)为X的所有非空紧子集赋予Hausdorff 度量所得空间. 针对Román-Flores提出的f混沌是否蕴涵混沌以及Fedeli提出的什么时候f混沌蕴涵混沌的问题, 探讨f与的传递、弱混合和混合等相关动力性质之间的关系, 并应用所得结果对Román-Flores的问题和Fedeli的问题给出了满意的回答.     

诱导的I-fuzzy拓扑生成序空间

本文研究了模糊拓扑生成序空间与其诱导的I-fuzzy拓扑生成序空间之间的关系.利用三种Lowen映射内在关联的方法,引入了三种I-fuzzy拓扑生成序空间,建立了诱导的I-fuzzy拓扑生成序空间理论.获得了诱导的I-fuzzy拓扑与诱导的I-fuzzy拓扑生成序之间的从属关系.     

超空间与原空间动力系统之间的关系

设(X,d,f)为拓扑动力系统,其中X为局部紧可分的可度量化空间,d为紧型度量,f为完备映射,用2X表示由X的所有非空闭子集构成的集族,(2X,ρ,2f)为由(X,d,f)所诱导的赋予hit-or-miss拓扑的超空间动力系统.本文引入了余紧点传递和弱拓扑传递的定义.特别的,在X满足一定的条件时,给出了点传递,弱拓扑传递和余紧点传递之间的关系,并研究了(X,d,f)的余紧传递点,回复点和几乎周期点分别与(2X,ρ,2f)的传递点,回复点和几乎周期点之间的蕴含关系.这些结论丰富了赋予hit-or-miss拓扑的超空间的研究内容.     

诱导I-Fuzzy拓扑空间

本文引入了生成I-Fuzzy拓扑空间的概念,研究了Fuzzifying拓扑空间(X,τ)与其相应的生成I-Fuzzy拓扑空间(IX,ω(τ))的联系;然后介绍了ω,ι算子及它们的运算性质;最后给出并研究了I-Fuzzy诱导空间,I-Fuzzy弱诱导空间,I-Fuzzy满层空间的定义和它们间的联系.     

L-fuzzy拓扑空间的弱诱导化

对任一L-fuzzy拓扑空间,本文给出了两个与之密切相关的弱诱导空间,从而证明了弱诱导空间范畴是一般fuzzy拓扑空间范畴的反射和余反射满子范畴.特别地我们较详细地讨论了次T_o完全正则空间的弱诱导化.     

赋予hit—or-miss拓扑超空间动力系统的拓扑熵

设（X,d,f）为拓扑动力系统,其中X为局部紧第二可数Hausdorff空间,d为紧型度量,f为完备映射,用2^x和f分别表示由X的所有非空闭子集和所有闭子集构成的集族,（2^x,ρ,2^f）和（f,ρ,2^f）为由（X,d,f）诱导的赋予hit—or—miss拓扑的超空间动力系统．本文研究了h（X,d,f）和h（2^...     

诱导的L-fuzzy拓扑空间的α-结构

本文研究Ｌ－ｆｕｚｚｙ 拓扑空间的一类几乎开Ｌ－ｆｕｚｚｙ 集的性质,在Ｌ－ｆｕｚｚｙ 拓扑空间中引入了α－结构的概念,证明了由一般拓扑空间（Ｘ,Ｔ）诱导的Ｌ－ｆｕｚｚｙ 拓扑空间（ＬＸ,ＷＬ（Ｔ））的α－结构必是ＬＸ 上的Ｌ－ｆｕｚｚｙ 拓扑,并且指出这个拓扑就是由一般拓扑空间（Ｘ,Ｔ）的α－ 结构诱导的．此外,本文还给出了与诱导的Ｌ－ｆｕｚｚｙ拓扑空间的α－结构相关的若干性质．     

定曲率空间中闭凸超曲面的唯一性定理

Certain topological properties of the hyperspaces have been studied in [1], [2]and[3]. In this paper we will discuss some topological properties of hyperspace[,2~T], and will generalize related results of Z. Michael [1], A. Frank, Chimenti,[2],寿纪麟[4].     

序列伪轨跟踪性与拓扑可迁

给出序列伪轨跟踪性的定义,得到拓扑可迁的一个充分条件,并证明,若f是同胚,则f具有序列伪轨跟踪性当且仅当其逆极限空间上的移位映射σf具有序列伪轨跟踪性。     

Interval Topology and Order-Convergence in the Hyperspace of a Topological Space

In the hyperspace Exp X of all closed subsets of a topological space X interval and order topology solely use the ?-relation in Exp X for their definitions whereas HAUSDORFF set convergence and VIETORIS topology use neighbourhoods in X itself. Nevertheless there exist intimate but non-trivial relations between them.     

Topologies of the Hyperspace which Are Induced by Extension Spaces

The hyperspace of all nonvoid closed subsets of a topological space will be topologized by means of different methods; each of them generalizes known definitions of special hyperspace topologies. One method uses the VIETORIS topology in the hyperspaces of certain extension spaces. Another one uses certain systems of closed subsets and leads to just the same class of hyperspace topologies. In natural order VIETORIS topology is the supremum of this class, and for locally compact spaces FLACHSMEYER topology is the infimum of this class.     

Funny Rank One and the Approximate Transitivity for Induced Actions

 Let H be a closed normal subgroup of a locally compact separable group G, and suppose that H acts ergodically on a Lebesgue space. If both the given H-action and the natural G-action on G/H have funny rank one, then the induced G-action has it also. For G solvable, the second condition is always true. A similar (but easier) theorem is also true for approximately transitive actions, even without the normality assumption on H.     

Funny Rank One and the Approximate Transitivity for Induced Actions

 Let H be a closed normal subgroup of a locally compact separable group G, and suppose that H acts ergodically on a Lebesgue space. If both the given H-action and the natural G-action on G/H have funny rank one, then the induced G-action has it also. For G solvable, the second condition is always true. A similar (but easier) theorem is also true for approximately transitive actions, even without the normality assumption on H. Received 23 February 1998     

Topological r-entropy and Measure Theoretic r-entropy of Flows

The topological r-entropy and measure theoretic r-entropy of a flow are studied. For a flow(X, φ), it is shown that topological(measure theoretic) r-entropy is equal to the topological(measure theoretic) entropy of the time one map φ1 as r decreases to zero. The Brin–Katok’s entropy formula for r-entropy is also established.