共查询到20条相似文献,搜索用时 109 毫秒
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在fuzzify ing拓扑空间中,利用fuzzify ing半开集、fuzzify ing半邻域系及fuzzify ing半闭包等概念导入了ST0-,ST1-,ST2-,ST3-,ST4-分离公理,并给出这5个公里的等价命题以及它们的关系。 相似文献
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在L-拓扑空间中利用半开βa-覆盖引入了半Nβ-紧性。讨论了半Nβ-紧性的性质,如一个半Nβ-紧集与一个半闭集的交仍为半Nβ-紧的;半Nβ-紧性在不定映射下保持不变;由分明拓扑空间(X,τ)拓扑生成的L-拓扑空间(LX,ωL(τ))是半Nβ-紧的当且仅当(X,τ)是半紧的。此外,还讨论半Nβ-紧性与半紧性的关系。 相似文献
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关于L—Fuzzy子集仿紧性的注记 总被引:2,自引:1,他引:2
本文意在指出L-fuzzy拓扑学中关于L-fuzzy子集仿紧性的几种定义不是一般拓扑学中子集仿紧性的真正推广,即它们不以分明子集仿紧性为特款。进一步修正了这些定义并重新证明了有关的几个定理。 相似文献
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在拓扑空间(X,T)中提出了α-拓扑空间(X,Tα),对(X,Tα)中的开集的判别法进行了研究,在遗传性方面得到了一些重要的结论. 相似文献
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在L-fuzzy拓扑空间上引入了S-紧和S-仿紧的概念,证明了Tychonoff定理对S-紧是成立的;证明了弱诱导的L-fuzzy拓扑空间是S-仿紧的,当且仅当(X,[δ])是仿紧的。并且证明了满足S-T2分离性的S-仿紧的L-fuzzy拓扑空间是S-正则。 相似文献
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Inthispaper,allspacesareregularandT1,andallmappingsarecontinuousandonto .Readersmayreferto [1 ]forunstateddefinitions. Quiterecently ,somecharacterizationsforcertainL imagesofparacompactlocallycompactspaceshavebeenobtainedin [2 ] .Similarly ,wecanestablishthech… 相似文献
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M. G. Charalambous 《Applied Categorical Structures》2002,10(5):521-530
We present a general construction from which one can derive in a unified manner (i) the Stone–ech compactification of a frame, (ii) the Lindelöf coreflection for both frames and nearness frames and (iii) the paracompact coreflection in the category of frames. 相似文献
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Strashimir G. Popvassilev 《Topology and its Applications》2010,157(16):2553-2554
Generalizing results of Yang Gao, Lei Mou and Shangzhi Wang, as well as a result of the author, we prove that a topological space is locally compact and metacompact if and only if its product with every compact space is base-cover metacompact. 相似文献
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We show that any metacompact Moore space is monotonically metacompact and use that result to characterize monotone metacompactness in certain generalized ordered (GO) spaces. We show, for example, that a generalized ordered space with a σ-closed-discrete dense subset is metrizable if and only if it is monotonically (countably) metacompact, that a monotonically (countably) metacompact GO-space is hereditarily paracompact, and that a locally countably compact GO-space is metrizable if and only if it is monotonically (countably) metacompact. We give an example of a non-metrizable LOTS that is monotonically metacompact, thereby answering a question posed by S.G. Popvassilev. We also give consistent examples showing that if there is a Souslin line, then there is one Souslin line that is monotonically countable metacompact, and another Souslin line that is not monotonically countably metacompact. 相似文献
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It is shown that every connected vertex and edge transitive graph has a normal multicover that is a connected normal edge transitive Cayley graph. Moreover, every chiral or regular map has a normal cover that is a balanced chiral or regular Cayley map, respectively. As an application, a new family of half-transitive graphs is constructed as 2-fold covers of a family of 2-arc transitive graphs admitting Suzuki groups. 相似文献
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Thispaperiscontinuationsof[1],westilltousemarksandtermsin[1]andtheothertermsagreewith[2]and[3].LetEandFbetwoHausdorfftopologicalvectorspaces,XE,YFbetwononemptysets,FbethedualspaceofF,A:X→2YandB:Y→2Fbetwoset-valuedmapping,T:Y→Xbeinvertible.Inthisp… 相似文献
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