模糊数空间的紧化

通过表明模糊数空间上的下方图形度量拓扑与Fell拓扑一致,给出了带有下方图形度量的模糊数空间的一个自然的紧化.     

L-Smooth紧

在模糊格上讨论Smooth拓扑空间的Smooth紧性,它定位于每一个模糊集,并兼顾整个Smooth拓扑空间。     

L-拓扑空间的弱局部强F紧性及单点强F紧化

以R.Lowen的强F紧性为基础,定义了L-拓扑空间的弱局部强F紧性及单点强F紧化,推广了有关弱局部紧拓扑空间和拓扑空间的单点紧化的若干结果,证明了L-拓扑空间的弱局部强F紧性是拓扑空间的弱局部紧性的L-推广。     

RL-拓扑及其紧性

本文提出了$L$-模糊子集$A$上$RL$-拓扑的概念,使得$L$-拓扑成为其特殊情形.给出了$RL$-拓扑空间之间$RL$-连续映射的定义,并利用不等式探讨了$RL$-拓扑的紧性,引入了$RL$-紧的定义,并研究了该紧性的若干性质.     

Fell-拓扑的伪紧性（英文）

设X是拓扑空间，CL（X）表示X的所有非空闭子集的族，本文得到了下述结果：在CL（X）上的Fell-拓扑是伪肾的当且仅当X是feebly-紧或者非局部紧或者非σ－紧，由此得到了对于伪紧性不是闭遗传的两类新的拓扑空间。     

L-拓扑空间的单点超F紧化

给出L-拓扑空间的单点超F紧化的一种具体作法,以及局部超F紧性的定义,并证明了:(1)局部超F紧性是L-好推广;(2)一个L-拓扑空间是局部超F紧T2空间当且仅当其单点超F紧化空间是超F紧T2空间;(3)单点超F紧化在同胚意义下是唯一的。     

L-模糊SP-紧集

本文在L-模糊拓扑空间引入了一种新的紧性—SP-紧性，给出了SP-紧性的α-网，α-滤子，r-SP-覆盖，r^ -有限交性质等多种刻画．这种紧性是针对任意L-模糊子集来定义的，且保持了一般拓扑空间中紧性的许多好的性质．     

不分明Stone-ech紧化

<正> 在不分明拓扑空间理论中,Stone-ech紧化问题是令人关注的,而且已有一些工作(参看[7]),但已有的探讨只是限于由通常拓扑生成的(topologically generated)一类较特殊的不分明拓扑空间中进行;其总的思路是把这个问题回归到通常拓扑空间的Stone-Cech紧化的问题.至于一般不分明拓扑空间中这个问题的探讨,则因现有文献中与此相关的     

不分明化拓扑中近似紧性和几乎紧性

在不分明化拓扑空间中,从正则开集出发引入了近似紧性和几乎紧性的概念,并且给出了它们的一些性质.这些概念的结合有助于我们对不分明化拓扑的研究。     

直觉I-fuzzy拓扑空间中的(r,s)直觉模糊紧

介绍了直觉I-fuzzy拓扑空间中(r,s)直觉模糊半正规的定义,研究了直觉I-fuzzy拓扑空间中直觉弱连续、直觉弱开和直觉弱闭映射的等价定理及(r,s)直觉模糊紧,(r,s)直觉模糊殆紧、(r,s)直觉模糊几乎紧的相关定理.     

L—不分明拓扑空间的Alexandorff紧化

给出了一般的Ｌ－不分明拓扑空间的Ａｌｅｘａｎｄｏｒｆｆ紧化，并且对弱诱导空间证明了该紧化是弱诱导紧化类中唯一最小的紧化。     

不分明嵌入理论及其应用

本文讨论一类格上拓扑学中嵌入问题,确切说是讨论值域为fuzzy格的L不分明拓扑空间中嵌入理论及其应用.首先概述若干诸如不分明单位区间、重域构造以及格上保并映射类的代数运算等基础性成果.其次给出不分明完全正则的点式刻划与关于一致结构的著名Weil定理的不分明推广并从而建立了在不分明单位方体中一般性的嵌入定理.最后作为嵌入定理的应用,得到了不分明Urysohn度量化定理并完成了不分明Stone-Cech紧化的一般理论。     

Compact Hausdorff fuzzy topological spaces are topological

Many examples of compact fuzzy topological spaces which are highly non topological are known [5, 6]. Equally many examples of Hausdorff fuzzy topological spaces which are highly non topological can be given. In this paper we show that the two properties - compact and Hausdorff - combined however necessarily imply that the fuzzy topological space is topological. This at once solves some open questions with regard to the compactification of fuzzy topological spaces [8]. It also emphasizes once more the particular role played by compact Hausdorff topological spaces not only in the category of topological spaces but even in the category of fuzzy topological spaces.     

Superextensions which are Hilbert cubes

It is shown that each separable metric, not totally disconnected, topological space admits a superextension homeomorphic to the Hilbert cube. Moreover, for simple spaces, such as the closed unit interval or then-spheresS _n , we give easily described subbases for which the corresponding superextension is homeomorphic to the Hilbert cube.     

Compactness in fuzzy convergence spaces

Lowen and Lowen [Applications of category theory to fuzzy subsets (Kluwer, 1992) p. 153] and Lowen et al. [Fuzzy Sets and Systems 40 (1991) 347] recently introduced the category FCS of fuzzy convergence spaces, a topological quasitopos which is a supercategory of FTS, the category of fuzzy topological spaces. In this paper, compactness in FCS is examined. Doing so we found that to define compactness as an absolute property we had to generalize the definition of fuzzy convergence space to fuzzy subsets. All basic theorems are proved including the Tychonoff product theorem. Based on the theory developed here, in a following publication, a Richardson compactification for fuzzy convergence spaces will be given.     

A compactification of the moduli variety of stable vector 2-bundles on a surface in the Hilbert scheme

A new compactification of the variety of moduli of stable vector 2-bundles with Chern classes c ₁ and c ₂ is constructed for the case in which the universal family of stable sheaves with given values of invariants is defined and there are no strictly semistable sheaves. The compactification is a subvariety in the Hilbert scheme of subschemes of a Grassmann manifold with fixed Hilbert polynomial; it is obtained from the variety of bundle moduli by adding points corresponding to locally free sheaves on surfaces which are modifications of the initial surface. Moreover, a morphism from the new compactification of the moduli space to its Gieseker-Maruyama compactification is constructed.     

A Stone-Čech ultrafuzzy compactification

It is shown that if (X, F) is a fuzzy topological space whose induced topology is Tychonoff, then (X, F) has a Stone-?ech ultra-fuzzy compactification.     

Relaxed inf-compactness for variational problems by Hilbert cube compactification

Inf-compactness of the objective functional in an abstract variational problem, where the dynamical system consists of a linear functional-integral equation, is proven by suitably topologizing the space of relaxed control functions. The topology is obtained quite naturally from a Hilbert cube compactification of the space of control points. Under additional convexity assumptions a general existence result, implying that of A. D. Ioffe (Dokl. Akad. Nauk SSSR205 (1972), 277–280; Soviet Math. Dokl.13 (1972), 919–923) is proven.     

Symmetric spaces of higher rank do not admit differentiable compactifications

Any nonpositively curved symmetric space admits a topological compactification, namely the Hadamard compactification. For rank 1 spaces, this topological compactification can be endowed with a differentiable structure such that the action of the isometry group is differentiable. Moreover, the restriction of the action on the boundary leads to a flat model for some geometry (conformal, CR or quaternionic CR depending of the space). One can ask whether such a differentiable compactification exists for higher rank spaces, hopefully leading to some knew geometry to explore. In this paper we answer negatively.