公理化凸空间的闭包算子和内部算子

引入公理化凸空间框架下的闭包算子和内部算子,分别称之为凸闭包算子和凸内部算子.结果表明,论域X上的凸结构全体不仅等价于论域X上的凸闭包算子全体,而且等价于论域X上的凸内部算子全体.     

L-Fuzzy闭包算子的扩张原理

Ｆｕｚｚｙ闭包算子的扩张原理揭示了Ｆｕｚｚｙ闭包算子与经典闭包算子之间的密切关系,是利用传统学科已有结论研究Ｆｕｚｚｙ数学相关理论的有效工具。本文讨论了当Ｌ为有限分配格时,Ｌ－Ｆｕｚｚｙ闭包算子与闭包系统的扩张问题,并给出一种具体的由经典闭包算子生成Ｌ－Ｆｕｚｚｙ闭包算子的方法及其部分性质。     

Toeplitz算子空间的W—闭包

本文讨论了Ｔｏｅｐｌｉｔｚ算子空间的Ｗ－闭包，我们证明了Ｂｅｒｇｍａｎ空间Ｌ＾２ａ（Ｄ）上全体Ｔｏｅｐｌｉｔｚ算子的Ｗ闭包等于Ｂ（Ｌ＾２ａ（Ｄ）（定理１），另外，我们给出Ｃ＾ｍ（ｎ＞１）中单位球面Ｓ上的Ｈａｒｄｙ空间Ｈ＾２（Ｓ）上的Ｔｏｅｐｌｉｔｚ算子的一个有趣刻划（命题２）。     

Fuzzifying闭包系统的研究

在Fuzzifying(模糊化)数学的框架下,建立了Fuzzifying闭包系统和Birkhoff型Fuzzifying闭包算子的概念; 引入了Fuzzifying闭包空间范畴和Fuzzifying闭包系统空间范畴,并从范畴论的角度证明Birkhoff型Fuzzifying闭包算子与Fuzzifying闭包系统是协调的.最后文中还得到Fuzzifying闭包空间范畴和Fuzzifying闭包系统空间范畴可以嵌入到Birkhoff型L-闭包空间范畴这一重要结果.     

关于L—fuzzy拓扑空间的闭包算子与乘积算子的可交换性

本文利用Fuzzy格的代数性质,从L-fuzzy拓扑的层次结,构入手,定义了闭包保层空间,藉助于它给出了满层L-fuzzy拓扑空间的闭包算子与乘积算子可交换的等价条件,并证明了:若乘积L-fuzzy拓扑空间的每个因子空间都是诱导的,则闭包算子与乘积算子是可交换的,从而较好地解决了[2]中所提出的问题。     

(L,M)-fuzzy闭包系统与(L,M)-fuzzy闭包算子

定义了(L,M)-fuzzy闭包系统与(L,M)-fuzzy闭包算子的概念,建立了给定集合X上(L,M)-fuzzy闭包系统的全体FCS(L,M,X)和(L,M)-fuzzy闭包算子的全体FCO(L,M,X)之间的一一对应(在此基础上证明了(L,M)-fuzzy闭包系统空间范畴LMFCSS与(L,M)-fuzzy闭包算子空间范畴LMFCOS是同构的)。此外还证明了(2,M)-fuzzy闭包系统空间范畴2MFCSS可嵌入到(L,M)-fuzzy闭包系统空间范畴LMFCSS,(2,M)-fuzzy闭包算子空间范畴2MFCOS可嵌入到(L,M)-fuzzy闭包算子空间范畴LMFCOS。     

L-偏序集上的闭包系统

给出L-幂集上LK-闭包系统的等价刻画。提出L-偏序集上闭包系统的概念并讨论其基本性质。最后,将经典偏序集和L-幂集上关于闭包算子和闭包系统的对应理论推广到L-偏序集上。     

光滑l-Fuzzy拓扑空间的闭包算子

本文的目的是在光滑L—fuzzy拓扑空间上给出闭包算子的概念，利用集合套的方法给出它的一些等价刻画，并讨论它的性质及其应用．     

拟阵闭包算子诱导拓扑空间的分离性

拟阵是图论与代数的结合,而拓扑学是一门重要的数学基础学科.利用拟阵理论研究拓扑空间,从而将两者进行融合,通过拟阵的闭包算子定义拟阵拓扑空间,进一步利用拟阵闭包算子与拓扑闭包算子之间的关系,讨论拟阵拓扑空间的分离性.     

Toeplitz算子空间的ω~＊－闭包

本文讨论Ｔｏｅｐｌｉｔｚ算子空间的ω￣＊－闭包．我们证明Ｂｅｒｇｍａｎ空间上全体Ｔｏｅｐｌｉｔｚ算子的ω￣＊－闭包等于（定理１）．另外，我们给出Ｃ￣ｎ（ｎ＞１）中单位球面Ｓ上的Ｈａｒｄｙ空间Ｈ￣２（Ｓ）上的Ｔｏｅｐｌｉｔｚ算子的一个有趣刻划（命题２）．     

Quantaloid-enriched 范畴上的闭包算子与闭包系统

In this paper, we introduce the fundamental notions of closure operator and closure system in the framework of quantaloid-enriched category. We mainly discuss the relationship between closure operators and adjunctions and establish the one-to-one correspondence between closure operators and closure systems on quantaloid-enriched categories.     

Closure Operators and Lattice Extensions

For closure operators Γ and Δ on the same set X, we say that Δ is a weak (resp. strong) extension of Γ if Cl(X, Γ) is a complete meet-subsemilattice (resp. complete sublattice) of Cl(X, Δ). This context is used to describe the extensions of a finite lattice that preserve various properties. This revised version was published online in September 2006 with corrections to the Cover Date.     

Closure Operators with Respect to a Functor

A notion of closure operator with respect to a functor U is introduced. This allows us to describe a number of mathematical constructions that could not be described by means of the already existing notion of closure operator. Some basic results and examples are provided.     

Compactness, Perfectness, Separation, Minimality and Closedness with Respect to Closure Operators

In this paper, the characterization of closed and strongly closed subobjects of an object in categories of various types of filter convergence spaces is given and it is shown that they induce a notion of closure. Furthermore, each of the notions of compactness, perfectness, separation, minimality and absolute closedness with respect to these two new closure operators are characterized in these categories and some known results are re-obtained.     

Integral Operators and Absolute Convergence Systems

We use some integral operators to establish a few special properties of absolute convergence systems for l ².     

Banach格上正则算子格

本文首先对 Ｂａｎａｃｈ格 Ｅ给出了条件,使得对任意非 Ｄｅｄｅｋｉｎｄ　σ－完备的Ｂａｎａｃｈ格Ｆ,正则算子空间Ｌ~ｒ（Ｅ,Ｆ）均是一Ｒｉｅｓｚ空间．其次对Ｂａｎａｃｈ格Ｆ给出了一些刻划,使之每个由Ｌ_ｐ－空间到Ｆ内的连续线性算子均是正则的．一些相关结果也得以讨论．     

Hilbert格上正算子的谱

Some spectral characterizations of positive operators on Hilbert lattices are pre- sented.The application of these results can yield some equivalent relations of an irreducible positive operator.Some related results for positive operators on Hilbert lattice are also obtained.     

由子基生成的内部算子和闭包算子

本文研究粗糙集与拓扑空间的关系,统一地使用拓扑空间中的集合关于子基的内部和闭包来研究粗糙集理论和覆盖广义粗糙集理论中的下近似集和上近似集,以及由它们导出的关于子基的开集,导集,闭集,边界．研究这两个概念及由它们导出的相关概念的性质不仅对于粗糙集理论,而且对于拓扑学本身都有重要的理论和实际应用意义．     

On Finite Elements in Lattices of Regular Operators

Let E and F be vector lattices and the ordered space of all regular operators, which turns out to be a (Dedekind complete) vector lattice if F is Dedekind complete. We show that every lattice isomorphism from E onto F is a finite element in , and that if E is an AL-space and F is a Dedekind complete AM-space with an order unit, then each regular operator is a finite element in . We also investigate the finiteness of finite rank operators in Banach lattices. In particular, we give necessary and sufficient conditions for rank one operators to be finite elements in the vector lattice . A half year stay at the Technical University of Dresden was supported by China Scholarship Council.     

A Relation Between Closure Operators on a Small Category and Its Category of Presheaves

In this paper we show that each factorization structure on a small category , satisfying certain conditions, yields a presheaf on and a morphism of presheaves . We then give connections, and set up one to one correspondences, between subclasses of the following classes: (a) closure operators on (b) subobjects of (c) morphisms from to (d) weak Lawvere–Tierney topologies (e) weak Grothendieck topologies (f) closure operators on .