诱导I(L)-拓扑空间中网的收敛性及其应用

本文给出了诱导I(L)-拓扑空间中网的收敛性的一个刻画,利用它得到了良紧性是I(L)-“好的推广”的一个简洁的证明.     

I(L)弱诱导空间

引入 I(L)弱诱导空间与 I(L)底空间的概念 ,证明 I(L )弱诱导空间是遗传的、可乘的 ,给出一个 I(L)拓扑空间是 I(L )弱诱导空间的充分必要条件。     

I(L)值半连续映射与一类新的诱导空间

本文讨论了I(L)值半连续映射的基本性质,证明了当L为具有逆序对合对应的无穷分配格时,L-不分明拓扑空间(L~X,δ)上的所有 I(L)值下半连续映射的集对任意并与有限交运算封闭,因而诱导出一个 I(L)—不分明拓扑空间(I(L)~X,ω(δ));然后讨论了诱导空间的一些性质,特别证明了它们是保乘积的,并且给出了 I(L)—不分明拓扑空间是诱导空间的充要条件。     

L—Fuzzy拓扑空间的仿紧性和强仿紧性

仿紧性是分明拓扑学中的一个重要概念,如何合理定义LF拓扑中的仿紧性是一引人注目的课题。基于良紧性的几何刻划[4],文[3]和文[2]分别引入F拓扑中的局部有限族和仿紧性。文[2]对弱诱导的仿紧空间进行了比较深入的研究。但[2]和[3]的讨论还没有涉及到仿紧性的可乘性、分离性等问题。此外[2]引入了另一种局部有限性质:     

拓扑分子格的S紧性和S次紧性

利用半开元等半拓扑概念在拓扑分子格中引入S紧性与S次紧性，给出了它们的刻画，推广了文[1]中的紧性与次紧性，证明了拓扑分子格的S紧性，S次紧性，STi分离性(i=-1，0，1，2)与STi^*分离性(i=0，1，2)为半拓扑性质。     

L—Fuzzy拓扑空间中局部F紧性的可乘性

在文[9]中,作者提出了六种L—Fuzzy拓扑空间中的局部F紧性。即,强局部F紧性、星强局部F紧性,局部F紧性,星局部F紧性,弱局部F紧性和星弱局部F紧性。本文讨论了L-Fuzzy拓扑空间族的乘积空间(L~x,δ)的六种局部F紧性与其因子空间的相应局部F紧性之间的关系。证明了前四种局部F紧性是有限可乘性质,后两种局部F紧性是积稀有限可乘性质。最后给出了一类特殊空间是星局部F紧空间或星弱局部F紧空间的充要条件。     

L—fuzzy拓扑向量空间的归纳拓扑

利用L－fuzzy拓扑向量空间理论^[1]-[6],本文研究了由L-fuzzy线性序同态族所确定的L－fuzzy归纳拓扑后一些性质,给出了由单一Luzzy线性序同态所确定的L-fuzzy归纳拓扑的一个特征刻划,利用此结果,证明了L-fuzzy拓扑向量空间的商空间亦是L-fuzzy拓扑向量空间。     

R（L）弱诱导空间及其连通性

本文研究了R(L)弱诱导空间的性质及其与R(L)底空间在连通性方面的关系.利用文献[4]中I(L)弱诱导空间引入了R(L)弱诱导空间概念,得到了R(L)弱诱导空间的本质刻划定理.它表明:R(L)弱诱导空间是连通的当且仅当其R(L)底空间是连通的.     

L-拓扑空间的局部Nβ-紧性

本文在文献[4]的基础上,研究了L-拓扑空间的局部Nβ-紧性.借助于完全Nβ-紧集和强邻域,定义了L-拓扑空间的局部Nβ-紧性,证明了它是闭可遗传的、有限可乘的、且在连续开满的L值Zadeh型函数下保持不变,说明了它是一种L-好的推广性质.     

算子矩阵代数的自反性和超自反性

本文总假定 H 是可分的 Hilbert 空间;L(H)表示 H 上有界线性算子全体;而 L(?)(H)表示 L(H)上σ-ω算子拓扑连续的线性泛函全体.设(?)L(H)为σ-ω算子拓扑闭的子代数,(?)称为自反的是指(?)=Alg Lat(?)={T∈L(H):TE(?)E (?)E∈Lat(?)},其中 Lat(?)是(?)的不变子空间格.(?)称为超自反的是指存在常数 K>0,使对任意的 T∈L(H)有 d(T,(?))≤K sup{‖P_M~(?)TP_M‖∶M∈Lat(?)}.其中 P_M 是指到 M 上的自伴投影。有关算子代数的超自反性已有一些结果,例如见     

Separation properties of induced I(L)-topological spaces

The concept of induced I(L)-topological spaces has been introduced by Kubiak (Ph.D. Thesis, UAM, Poznan, 1985) and independently by Wang (Kexue Tongbao 34 (5) (1989) 333). In this paper, the separation properties in the sense of Hutton–Reilly of induced I(L)-topological spaces are investigated. The main result of the paper is a characterization of L-topological spaces by means of the appropriate Hutton–Reilly separation properties of its induced I(L)-topological space.     

R(L)型诱导空间及连通性

本文研究了R（L）-型诱导空间，利用R（L）-值下半连续函数，讨论了R（L）型诱导空间的基本性质，得到了R（L）型诱导空间保持笛卡积和连通性，并证明了诱导映射和生成映射是可交换的。     

On -topological vector spaces generated by a co-tower of L-topological vector spaces

In this paper, a characterization for an I(L)-topological space to be generated by a given co-tower of L-topological spaces is obtained. Moreover, the relationship between some properties of an I(L)-topological vector space generated by a co-tower of L-topological vector spaces and the corresponding properties of the given co-tower of L-topological vector spaces is investigated. Our results show that if an I(L)-topological vector space generated by a co-tower of L-topological vector spaces has some properties, such as local convexity and local boundedness, then all L-topological vector spaces in the co-tower also have the same properties. But the converse is incorrect even in the case of I-topological vector space generated by a co-tower of classical topological vector spaces. Finally, we supply a necessary and sufficient condition for an I(L)-topological vector space generated by a co-tower of L-topological vector spaces with some properties, such as local convexity and local boundedness, to have such properties too.     

Nonstandard Analysis Methods for Separations in[0,1]-topological Spaces

In nonstandard enlargement,the separations are characterized by nonstandard analysis methods in[0,l]-topological spaces.Firstly,the monads of fuzzy point in[0,l]-topological spaces are described with remote-neighborhoods in nonstandard enlarged model.Then the nonstandard characterizations of separations in [0,l]-topological space are given by the monads.At last,relations of these separations are investigated.     

Hausdorff L-topological spaces over a base space

In this paper, we introduce the notion of Hausdorff L-topological spaces over a base space, where L is a complete lattice and give some characterizations of these spaces. And we show that the category of Hausdorff L-topological spaces over a base space is a reflective subcategory of the category of L-topological spaces over a base space.     

可加广义代数格上的 Tietze 扩张定理

可加的广义代数格范畴与 T₀ 拓扑空间范畴相等价, 从这个观点出发, 作者把可加广义代数格作为一个闭集格, 在其上建立 Urysohn 引理和 Tietze 扩张定理. 这是拓扑理论在格上的一种新推广, 有助于格上拓扑理论的研究和广义连续格理论的应用.     

The Jackson Inequality for the Best L2-Approximation of Functions on [0, 1] with the Weight x

Let L^2（[0, 1], x） be the space of the real valued, measurable, square summable functions on [0, 1] with weight x, and let n be the subspace of L2（[0, 1], x） defined by a linear combination of Jo（μkX）, where Jo is the Bessel function of order 0 and {μk} is the strictly increasing sequence of all positive zeros of Jo. For f ∈ L^2（[0, 1], x）, let E（f, n） be the error of the best L2（[0, 1], x）, i.e., approximation of f by elements of n. The shift operator off at point x ∈[0, 1] with step t ∈[0, 1] is defined by T（t）f（x）=1/π∫0^π f（√x^2 ＋t^2-2xtcosO）dθ The differences （I- T（t））^r/2f = ∑j=0^∞（-1）^j（j^r/2）T^j（t）f of order r ∈ （0, ∞） and the L^2（[0, 1],x）- modulus of continuity ωr（f,τ） = sup{｜｜（I- T（t））^r/2f｜｜：0≤ t ≤τ] of order r are defined in the standard way, where T^0（t） = I is the identity operator. In this paper, we establish the sharp Jackson inequality between E（f, n） and ωr（f, τ） for some cases of r and τ. More precisely, we will find the smallest constant n（τ, r） which depends only on n, r, and % such that the inequality E（f, n）≤ n（τ, r）ωr（f, τ） is valid.     

Convergence of logarithmic means of multiple Walsh-Fourier series

Norlund logarithmic means of multiple Walsh-Fourier series acting from space Llnd-1 L ([0, 1)d) ,d≥1 into space weak-L1([0,1)d) are studied. The maximal Orlicz space such that the Norlund logarithmic means of multiple Walsh-Fourier series for the functions from this space converge in d-dimensional measure is found.