内射拓扑分子格

本文证明了任给T_O拓扑分子格(L,η),以下三条等价:(1)(L,η)为正则内射拓扑分子格;(2)L为完备集环且其完备余素元集ht(L)形成一连续格,余拓扑η为该连续格ht(L)上的Scott闭集格;(3)存在T_O内射拓扑空间(X,Τ),(L,η)同胚于(P(X),Τ~c)在拓扑分子格范畴中的Sober化。此外,还给出了正则内射拓扑分子格、(一般)内射拓扑分子格以及正则内射分子格的一般结构。作为应用,重新证明了有指数元的拓扑分子格的结构。     

Approximating Orders in Meet-Continuous Lattices and Regularity Axioms in Many Valued Topology

It is shown that in a meet-continuous lattice L endowed with a multiplicative auxiliary order ≺ the family of all members of L which satisfy the axiom of approximation, i.e. α = {β ∈ L : β ≺ α}, is closed under finite infs and arbitrary sups. This is a key ingredient of a meet-continuous lattice proof that both regularity and complete regularity of many valued topology have subbasic characterizations. As a consequence, the frame law can now be eliminated from some fundamental results on completely regular L-valued topological spaces (e.g., this is the case in regard to the Tychonoff embedding theorem). The grant MTM2006-14925-C02-02 from the Ministry of Education and Science of Spain and FEDER is gratefully acknowledged by the second named author.     

Completely regular ordered spaces

We present an example of a completely regular ordered space that is not strictly completely regular ordered. Furthermore, we note that a completely regular ordered I-space is strictly completely regular ordered provided that it satisfies at least one of the following three conditions: It is locally compact, it is a C-space, it is a topological lattice.     

完全分配格上的点式拟一致结构

本文在完全分配格上建立了一种点式拟一致结构理论，许多一般拓扑中的相应定理都被得到了。特别地，我们证明了每个拓扑分子格都可以拟一致化。此外，还讨论了乘积拟一致分子格的拓扑结构。     

Sober拓扑分子格

A topological molecular lattice (TML) is a pair (L, T), where L is a completely distributive lattice and r is a subframe of L. There is an obvious forgetful functor from the category TML of TML‘s to the category Loc of locales. In this note,it is showed that this forgetful functor has a right adjoint. Then, by this adjunction,a special kind of topological molecular lattices called sober topological molecular lattices is introduced and investigated.     

对称拓扑分子格的直和

文章给出了对称拓扑分子格的直和概念,给出了拓扑分子格的直和的特征,证明了对称拓扑分子格的分离性Ti(i=-1,0,1,2)及可数性CⅠ,CⅡ是可和性质.     

Structure of continuous functions of a completely regular space

It is proved that any completely regular topological space is determined up to homeomorphism by the topological lattice (with the topology of pointwise convergence) of all its continuous real-valued functions. The well-known result of Kaplansky (for compact spaces) is a corollary of this theorem.Translated from Matematicheskie Zametki, Vol. 19, No. 6, pp. 863–869, June, 1976.     

A note on minimal topological spaces

Let (X,τ) be a completely Hausdorff space. LetP be any topological property which is implied by complete regularity. Let (X,τ), be minimal-P. Then it has been shown that (X,τ), is completely regular and hence compact.     

Topologies on abelian lattice ordered groups induced by a positive filter and completeness

We consider topologies on an abelian lattice ordered group that are determined by the absolute value and a positive filter. We show that the topological completions of these objects are also determined by the absolute value and a positive filter. We investigate the connection between the topological completion of such objects and the Dedekind–MacNeille completion of the underlying lattice ordered group. We consider the preservation of completeness for such topologies with respect to homomorphisms of lattice ordered groups. Finally, we show that topologies defined in terms of absolute value and a positive filter on the space C(X) of all real-valued continuous functions defined on a completely regular topological space X are always complete.     

On Regular Riesz Subspaces

The paper is devoted to investigations of properties of regular Riesz subspaces and connections between regularity and some topological properties. The problem if a topological closure preserves regularity is solved in the class of discrete Riesz spaces. We also characterize Dedekind complete Riesz spaces possessing the same classes of -regular and regular Riesz subspaces Moreover, various examples of regular and non regular Riesz spaces are presented.     

A bitopological point-free approach to compactifications

We study structures called d-frames which were developed by the last two authors for a bitopological treatment of Stone duality. These structures consist of a pair of frames thought of as the opens of two topologies, together with two relations which serve as abstractions of disjointness and covering of the space. With these relations, the topological separation axioms regularity and normality have natural analogues in d-frames. We develop a bitopological point-free notion of complete regularity and characterise all compactifications of completely regular d-frames. Given that normality of topological spaces does not behave well with respect to products and subspaces, probably the most surprising result is this: The category of d-frames has a normal coreflection, and the Stone-?ech compactification factors through it. Moreover, any compactification can be obtained by first producing a regular normal d-frame and then applying the Stone-?ech compactification to it. Our bitopological compactification subsumes all classical compactifications of frames as well as Smyth?s stable compactification.     

关于子基的正则空间和相对正则性

给出了关于子基的正则空间和相对正则性概念,研究了各种正则性之间的关系,证明了各种正则空间的充要条件,丰富了一般拓扑学中的正则空间和相对正则性理论．     

Topological regular semigroups and topological inductive groupoids

The theory of topological semigroups has emerged as a separate discipline during the fifties (cf. Hofmann and Mostert [5] and Carruth, Koch and Hildebrant [3]), but the idea of topologically consistent regularity in such semigroups does not seem to have gained much attention. In this paper topological regular semigroups are introduced where the regularity is topologically consistent. The topological version of the structure theorem for regular semigroups given by Nambooripad [7] is provided here. Some special cases are also discussed. The necessary terminology on topological groupoids are available in Brown and Hardy [1] and Mackenzie [6].     

Boolean algebras of lattice uniformities and decompositions of modular functions

We study decomposition theorems for modular functions on lattices and the relationship between such decompositions and lattice properties of a suitable system of uniformities. We give a purely topological characterization for the validity of a decomposition theorem of a certain type and examine when this topological condition is satisfied, namely when a system of lattice uniformities is a Boolean algebra consisting of permutable uniformities.      

赋层拓扑分子格及其紧性

拓扑分子格本身没有层次结构，为其构造某种层次成为很重要的问题。本文的构思是赋于分子格上的拓扑一种层次，从而使拓扑分子格具有丰富的层次性，其次讨论了保层次序同态与赋层积拓扑分子格，在此基础上建立了较理想的拓扑分子格的紧性。     

Free Distributive Completions of Partial Complete Lattices

The free distributive completion of a partial complete lattice is the complete lattice that it is freely generated by the partial complete lattice in the most distributive way. This can be described as being a universal solution in the sense of universal algebra. Free distributive completions generalize the constructions of tensor products and of free completely distributive complete lattices over partially ordered sets.     

Bands in lattices of operators

We consider the lattice of regular operators on a Dedekind complete Banach lattice. We show that in general the projection onto a band generated by a lattice homomorphism need not be continuous and that the principal bands need not be closed for the operator norm. In fact it is possible to find a convergent sequence of operators all the members of which are disjoint from the limit.

     

Completely Regular Objects and Normal Objects in Topological Categories

In this paper, various generalizations of the usual completely regular spaces and completely normal spaces to topological categories are given. Moreover, the relationships among various forms of these generalizations are investigated.     

Borel measures in consonant spaces

A topology on a set X is called consonant if the Scott topology of the lattice is compactly generated; equivalently, if the upper Kuratowski topology and the co-compact topology on closed sets of X coincide. It is proved that every completely regular consonant space is a Prohorov space, and that every first countable regular consonant space is hereditarily Baire. If X is metrizable separable and co-analytic, then X is consonant if and only if X is Polish. Finally, we prove that every pseudocompact topological group which is consonant is compact. Several problems of Dolecki, Greco and Lechicki, of Nogura and Shakmatov, are solved.     

Partial Kernel Normal Systems for Eventually Regular Semigroups

The set of P-partial kernel normal systems for an eventually regular semigroup S forms a complete lattice, which is a completely ∧-homomorphic image of C(S). Every regular congruence on S is uniquely determined by its P-partial kernel normal system.