L-拓扑空间中的θ-闭性

在L-拓扑空间中借助于θ-开L-集和它们的不等式给出了θ-闭性的定义,这里L是完备的DeMorgan代数.它也能够借助于θ-闭L-集和它们的不等式刻画.当L是完全分配的DeMorgan代数时,这种θ-闭性是L好的推广.     

模糊化弱拓扑和模糊化预拓扑

在模糊化拓扑空间基础上,放宽了模糊化拓扑结构的公理体系,引入模糊化弱拓扑和模糊化预拓扑的概念,并且讨论了它们构成的范畴和模糊化拓扑空间范畴的关系.结果表明,模糊化拓扑空间范畴既是模糊化弱拓扑空间范畴的双余反射满子范畴,又是模糊化预拓扑空间范畴的双余反射满子范畴.     

拓扑空间范畴、拓扑FUZZ范畴与拓扑分子格范畴间的反射与余反射

从整体角度出发，证明了拓扑空间范畴Ｔｏｐ分别是拓扑Ｆｕｚｚ范畴ＴｏｐＦｕｚ与拓扑分子格范畴ＴＭＬ的反射与余反射满子范畴，ＴｏｐＦｕｚ是ＴＭＬ的反射与余反射（非满）子范畴．     

L-拓扑空间中一类新的SR-紧性

利用强半开L-集和它们的不等式在L-拓扑空间引入了一种新的SR-紧性,这里L是完备的DeMorgan代数。这种新的SR-紧性不依赖于格L的具体结构。当L是完全分配的DeMorgan代数时,给出了它的许多刻画。     

L-双拓扑空间的LFα-p连通性的若干性质

文[1]首先提出了L-拓扑空间中的p-开集、p-闭集等概念,本文以此为基础,引入了L-双fuzzy拓扑空间的α-p连通性的概念,并研究了其若干基本性质.     

L-拓扑空间中的α-紧度

借助于格L的蕴涵算子,在L-拓扑空间中引入了模糊集的α-紧度的概念.一个L-模糊集G是α-紧的当且仅当它的α-紧度coma(G)=(T).我们还研究了α-紧度的一系列性质.     

L-拓扑空间中的β-闭性

在L-拓扑空间中借助于β-开L-集合和它们的不等式给出了β-闭性的一种新形式,这里L是完备的DeMorgan代数。它也能够借助于β-闭L-集和它们的不等式刻画。当L是完全分配的DeMorgan代数时,它的许多刻画被给出了。     

L-拓扑空间中的半拟紧性

在L-拓扑空间中借助于半拟开L-集合和它们的不等式给出了半拟紧性的一个新定义,这里L是完备的DeMorgan代数。它也能够借助于半拟闭L-集和它们的不等式刻画。当L是完全分配的DeMorgan代数时,它的许多刻画被给出了。     

r-拟半开L-集和r-拟半闭L-集

在L-fuzzy拓扑空间中引入r-拟半开L-集和r-拟半闭L-集,正则r-拟半开L-集和正则r-拟半闭L-集,同时讨论它们一些性质.     

L-预拓扑空间的强连通集和局部强连通L-预拓扑空间

定义L-预拓扑空间中的强连通L-子集以及L-预拓扑空间的局部强连通性,证明了它们和拓扑空间中的连通子集以及局部连通性拓扑空间有类似的性质,证明了局部强连通L-预拓扑空间和连续映射构成的范畴L-LSCPS是topological construct.     

The Answer to a Problem Posed by Zhao and Ho

Zhao and Ho asked in a recent paper that for each T_0 space X, whether KB(X)(the set of all irreducible closed sets of X whose suprema exist) is the canonical k-bounded sobrification of X in the sense of Keimel and Lawson. In this paper, we construct a counterexample to give a negative answer. We also consider the subcategory Top_κ of the category Top_0 of T_0 spaces, and prove that the category KBSob of k-bounded sober spaces is a full reflective subcategory of the category Top_κ.     

The Dedekind-MacNeille completion as a reflector

We introduce a special type of order-preserving maps between quasiordered sets, the so-called cut-stable maps. These form the largest morphism class such that the corresponding category of quasiordered sets contains the category of complete lattices and complete homomorphisms as a full reflective subcategory, the reflector being given by the Dedekind-MacNeille completion (alias normal completion or completion by cuts). Suitable restriction of the object class leads to the category of separated quasiordered sets and its full reflective subcategory of completely distributive lattices. Similar reflections are obtained for continuous lattices, algebraic lattices, etc.     

Nonexistence of Blow-up Flows for Symplectic and Lagrangian Mean Curvature Flows

In this paper we mainly study the relation between $|A|^2, |H|^2$ and cosα (α is the Kähler angle) of the blow up flow around the type II singularities of a symplectic mean curvature flow. We also study similar property of an almost calibrated Lagrangian mean curvature flow. We show the nonexistence of type II blow-up flows for a symplectic mean curvature flow satisfying $|A|^2≤λ|H|^2$ and $cosα≥δ>1-\frac{1}{2λ}(½≤α≤ 2)$, or for an almost calibrated Lagrangian mean curvature flow satisfying $|A|^2≤λ|H|^2$ and $cosθ≥δ>max\ {0,1-\frac{1}{λ}}(\frac34≤λ≤ 2)$, where θ is the Lagrangian angle.     

Are all localizing subcategories of stable homotopy categories coreflective?

We prove that, in a triangulated category with combinatorial models, every localizing subcategory is coreflective and every colocalizing subcategory is reflective if a certain large-cardinal axiom (Vopěnka?s principle) is assumed true. It follows that, under the same assumptions, orthogonality sets up a bijective correspondence between localizing subcategories and colocalizing subcategories. The existence of such a bijection was left as an open problem by Hovey, Palmieri and Strickland in their axiomatic study of stable homotopy categories and also by Neeman in the context of well-generated triangulated categories.     

Subcategories of fixed points of mutations by exceptional objects in triangulated categories

We first prove that the subcategory of fixed points of mutation determined by an exceptional object E in a triangulated category coincide with the perpendicular category of E. Based on this characterisation, we prove that the subcategory of fixed points of mutation in the derived category of the coherent sheaves on weighted projective line with genus one is equivalent to the derived category of a hereditary algebra. Meanwhile, we induce two new recollements by left and right mutations from a given recollement.     

FS-相容Domain的定向完备化及相关范畴性质

引入FS-相容Domain概念,研究FS-相容Domain的性质,主要结果有：（1）FS-相容Domain的收缩核与连续函数空间还是FS-相容Domain;（2）FS-相容Domain是有限生成上集,从而是Scott紧的;（3）FS-相容Domain的定向完备化是FS-Domaln;（4）有最大元的FS-Domain去掉最大元后是FS-相容Domain;（5）证明了以Scott连续映射为态射,FS-相容Domain为对象的范畴FS-CDOM是笛卡儿闭范畴并以FS-Domain范畴FS-DOM作为满的反射子范畴。     

一种对称损失函数下一类指数分布族刻度参数的估计

在p,q对称熵损失函数L(θ,δ)=θp/δp+δq/θq-2(p,q0)下,研究了一类指数分布族c(x,n)θ-ve-T(x)/θ的刻度参数θ的Bayes估计与可容许估计,并应用积分变换定理证明了这两个估计具有不变性.     

INSTANCES AND RAMIFICATIONS OF THE SEMI-ADJOINT SITUATION I. PRESTABLE REFLECTION AND SYMMETRIC UNADS

Abstract

It is well known that there is a one to one correspondence between idempotent monads in a category and reflective subcategories. In this paper it is examined what replaces the reflective subcategory if the idempotent monad is replaced (a) by a monad and (b) by a symmetric unad. It is shown that in case (a) one obtains the weakly reflective subcategory of objects injective relative to the functor part of the monad. In case (b) one obtains a proto-reflection and it is shown that (for complete categories) the associated orthogonal subcategory is reflective if and only if there exists a free monad associated to the unad.     

On the boundedness of topological categories

Let K be a complete and cocomplete category with a given proper (E,M)-factorization. K is called well-bounded if K is moreover bounded with a generator and cowellpowered with respect to the given factorization. Freyd-Kelly proved the following theorem about well-bounded categories: Let K be a well-bounded category and let Γ be a class of cylinders in the small category C¹, and let all but a set of these cylinders be cones. Then Γ(C,K) is a reflective subcategory of [C,K]. The main results of this paper are: (I) If F: K→L is a Top-functor and L is well-bounded, then K is well-bounded. (II) If U is an E-reflective subcategory of a well-bounded category,then U is again wellbounded. As a corollary one obtains for instance that all coreflective and all epireflective subcategories of the category of topological spaces are well-bounded.