半同胚空间类

集S(?)X称为半开的,如果存在开集U使得U(?)S(?)U~-,这里()-表示闭包算子。本文讨论了和(X,u)具有相同半开集族的X上的全体拓扑所构成的族(u)的结构。首先,给出了[u]中拓扑的一般形式和[u]中存在最弱拓扑的充要条件。其次,指出了若干非半拓扑性质,最后,讨论在拓扑空间的各种运算下,半同胚空间类的变化情况。     

Fuzzifying双拓扑空间中的半开集

引入了fuzzifying双拓扑空间中的(τi,τj)半开集(半开集)，(τi,τj)半邻域系统(半邻域系统)以及(τi,τj)半闭包和(τi,τj)半内部(半闭包，半内部)，最后给出了全连续映射。     

关于《M1-空间的和定理》一文的注记

《数学研究与评论》1988年第一期研究通讯栏目上刊登了论文《M_1-空间的和定理》。我们这篇简短的注记在于说明: (1)上述论文所引进的“强遗传闭包保持集族”的概念等价于“遗传闭包保持集族”的概念。 (2)上述论文中的定理3的结论是不正确的。 关于(1)若正则拓扑空间X的子集族B是X的遗传闭包保持集族,那么由B的元的闭包所组成的集族亦是X的遗传闭包保持集族。     

一种新的Fuzzifying拓扑空间中的半开集

利用不同于文献[7]的方法引入了Fuzzifying拓扑空间中的半开集的概念,通过实例说明本文定义的半开集概念不同于文献[7]中的相应的概念,且有明显优点.此外,利用新定义的半开集概念引入Fuzzifying拓扑空间中的半领域系,半闭包及半内部,最后作为应用定义了映射的Fuzzying半连续性并给出若干刻画条件.     

排它过程单调性的一个充分条件

设S为可数集,X={0,1}~S,本文讨论由[1]或[2]中定义的以X为相空间的排它过程的单调性问题,得到了以下的判别单调性的充分条件: ■η≤ζ,η,ζ∈X,若对于所有的满足η(u)=ζ(u)=1,η(v)=ζ(v)=0的u,v∈S,都有c(u,v,η)=c(u,v,ζ),则排它过程是单调的。     

超空间的连通性和c半层空间性质

设X是Hausdorff拓扑空间,超空间S(X)中的每一元素是X中有限个收敛序列的并且赋予Vietoris拓扑.主要讨论当空间X分别是序列连通、道路连通和c半层空间,则超空间S(X)是否分别是序列连通、道路连通和c半层空间.对这些问题给出(部分)回答.     

Fuzzifying拓扑空间中的强半开集

利用文献[3]中重新定义的半开集在Fuzzifying拓扑空间中引入了强半开集.此外,利用新定义的强半开集概念引入了强半邻域、强半闭包和强半内部,最后作为应用定义了映射的强半连续性并给出了若干等价刻画.     

FI代数上的MP滤子拓扑空间

首先,在FI代数X上以全体MP滤子之集为基建立了一个拓扑空间(X,F_(MP)).给出了拓扑空间(X,F_(MP))中集合A的导集、闭包和内部的计算公式.其次,考察了(X,X_(MP))的若干拓扑性质.最后,研究了乘积FI代数的乘积MP滤子拓扑.     

平面负位势相关的Schrödinger方程的非负广义解

设β是复平面上圆盘Ωa={z ||z|＜a}内的一个零容紧致集.考虑Ωβα=Ωα\β上的定常Schrodinger方程(-A+μ)u=0,其中位势μ≤0是Kato类Radon测度.将方程在广义函数意义下的在{z||z|=a}上取极限值0的非负连续解族记为μH+.对Ωβα的Kerekjato-Stoilow意义下的理想边界β的任一点ζ,本文通过定义μH+→μH+的线性算子πζ,引入Martin函数Kζ,证明了μH+=Hβ Pβ,其中Hβ={u∈μH+|πζ(u)=0,vζβ},Pβ={u∈μH+|u=∞∑i=i ciKζi,ζi∈β,ci≥0}.     

平面负位势相关的Schr(o)dinger方程的非负广义解

设β是复平面上圆盘Ωa={z ||z|＜a}内的一个零容紧致集.考虑Ωβα=Ωα\β上的定常Schrodinger方程(-A+μ)u=0,其中位势μ≤0是Kato类Radon测度.将方程在广义函数意义下的在{z||z|=a}上取极限值0的非负连续解族记为μH+.对Ωβα的Kerekjato-Stoilow意义下的理想边界β的任一点ζ,本文通过定义μH+→μH+的线性算子πζ,引入Martin函数Kζ,证明了μH+=Hβ Pβ,其中Hβ={u∈μH+|πζ(u)=0,vζβ},Pβ={u∈μH+|u=∞∑i=i ciKζi,ζi∈β,ci≥0}.     

Further properties on M-continuity

The concept of M-open sets [1] can be applied in modifications of rough set approximations [2], [3] which is widely applied in many application fields. The aim of this paper is to introduce and investigate some new classes of topological mappings called M-continuous mappings via M-open sets. Also,M-irresolute mappings which are stronger than M-continuous mappings are studied and the relationships between these mappings are investigated. Several properties of these new notions have been discussed and the connections between them are studied.     

The Pointwise Characterizations of Fuzzy Mappings and Fuzzy Cardinal Numbers

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Theorem of Kuratowski-Suslin for measurable mappings. II

The purpose of this paper is to describe these -measurable mappings on a separable complete metric space with the Borel measure , which transform every -measurable set onto a -measurable one. The obtained results are a generalization of the classical outcomes of Suslin and Kuratowski and the results from our previous paper.

     

The invariance of inner and outer linearly locally connected sets under quasiconformal mappings

In this paper, we prove that the inner and outer linearly locally connected sets of Rn are invariant respectively under quasiconformal mappings which fixed the point at infinity. On the other hand, we prove the converses of above results to be true also.     

Rigid sets and nonexpansive mappings

We introduce a new class of normed spaces (not necessarily finite dimensional), which contains the finite dimensional normed spaces with polyhedral norm. We study the properties of rigid sets of the spaces of this class and we apply the results to limit sets of the sequences of iterates of nonexpansive maps.

     

集值映射多目标规划问题的解集的连通性

本文研究了无限维空间里集值映射的多目标规划问题。主要结果是：当目标函数为类凸的集值映射时，其目标空间里的有效点集是连通的；若目标函数为Ｃ－凸的集值映射时，其有效解集也连通。     

Upper and Lower Semicontinuity for Set-Valued Mappings Involving Constraints

In vector optimization, several authors have studied the upper and lower semicontinuity for mappings involving constraints in topological vector spaces partially ordered through a cone with nonempty interior. In this paper, we give conditions about the upper and lower semicontinuity in the case that the ordering cone in the parameter space has possibly empty interior, as it happens in many function spaces and seqence spaces.     

Fuzzy集的基数

关于Fuzzy集的基数，[1]中曾对有限支集的Fuzzy集以及极苛刻条件下的无限Fuzzy集给出过一种定义。但是，正如本文将要指出的那样，该定义是不合理的。本文将从研究Fuzzy映射入手，给出Fuzzy集基数的一般性定义。基于这一定义，不但得到有关基数的大部分结论，而且有其自身的特殊性。     

Removable sets for continuous solutions of quasilinear elliptic equations

We show that sets of Hausdorff measure zero are removable for -Hölder continuous solutions to quasilinear elliptic equations similar to the -Laplacian. The result is optimal. We also treat larger sets in terms of a growth condition. In particular, our results apply to quasiregular mappings.