共查询到18条相似文献,搜索用时 156 毫秒
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讨论在直觉模糊度量空间上的拓扑半群作用,引入诸如拓扑传递性,点传递性及点稠传递性等概念.考虑非敏感性与传递性,等度连续等动力学性质的相互关系. 相似文献
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首先在一般区间值模糊关系上定义了两个论域上的一类广义区间值模糊粗糙集.借助区间值模糊集的截集给出区间值模糊粗糙上、下近似算子的一般表示.讨论了各种特殊的区间值模糊关系与区间值模糊近似算子性质之间的等价刻画.最后利用公理化方法刻画区间值模糊粗糙集.描述区间值模糊上、下近似算子的公理集保证了生成相同近似算子的区间值模糊关系的存在性. 相似文献
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定义区间值模糊集之间的一种新距离d*∞,讨论了这种距离的基本性质,并证明区间值模糊数的距离空间(IΦ*(R),d*∞)是完备的,但它却是不可分的。 相似文献
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利用区间值模糊集的区间值水平截集的概念,给出了区间值模糊点与区间值模糊集邻属关系的定义,将这种邻属关系应用到区间值模糊代数的研究中,从而给出了(α,β)-区间值模糊子群的定义。通过研究16种(α,β)-区间值模糊子群,指出有意义的是(∈,∈)((∈,∈∨q),(∈∧q,∈))-区间值模糊子群。证明了群G的一个区间值模糊子集A为(∈,∈)((∈,∈∨q)或(∈∧q,∈))-区间值模糊子群的充要条件是对所有的λ=[a1,a2]≤[0.5,0.5],[0.5,0.5]μ=[b1,b2],其区间值水平截集Aλ和Aμ(Aλ或Aμ)为G的三值模糊子群。从而建立了基于区间值模糊点和区间值模糊集邻属关系的新的区间值模糊子群理论。 相似文献
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将区间值模糊集的概念应用于R0-代数,引入区间值模糊R0-子代数的概念并研究它的性质。给出了区间值模糊集成为区间值模糊R0-子代数的一个充要条件;讨论了区间值模糊R0-子代数和R0-子代数之间的关系;定义了区间值模糊集的象和原象,获得了区间值模糊R0-子代数的象和原象成为区间值模糊R0-子代数的条件。 相似文献
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根据模糊关系的传递性的特征,文章提出了利用相应的模糊矩阵求有限论域上模糊关系的传递闭包的一种计算方法,该算法可以加快获得传递闭包的速度。通过实例说明了该算法是简便、实用的。 相似文献
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We study two related versions of the no-impatience postulate in the context of transitive and reflexive relations on infinite utility streams which are not necessarily complete. Both are excluded by the traditional (weak) anonymity axiom. We show explicit social welfare relations satisfying Strong Pareto and the weaker version of no-impatience that are compatible with continuity in all the traditional topologies in this field. However the stronger version of no-impatience is violated by all lower semi-continuous (in the sup or Campbell topologies) social welfare relations satisfying the Weak Pareto axiom. 相似文献
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讨论模糊关系的有界和 -有界积合成的基本性质。对于论域 U上的一个自反和有界传递的模糊关系 R,证明它是一个预序关系。得到关于有界算子的模糊线性方程有解的充要条件及解的递归结构。在此基础上给出有限论域上的模糊关系方程 A·X=B的求解方法 相似文献
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Let ACD(M,SL(d,R)) denote the pairs (f,A) so that f ∈ A ⊂ Diff1(M) is a C1-Anosov transitive diffeomorphisms and A is an SL(d,R) cocycle dominated with respect to f. We prove that open and densely in ACD(M,SL(d,R)), in appropriate topologies, the pair (f,A) has simple spectrum with respect to the unique maximal entropy measure μf. Then, we prove prevalence of trivial spectrum near the dynamical cocycle of an area-preserving map and also for generic cocycles in AutLeb(M) × Lp(M,SL(d,R)). 相似文献
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《Optimization》2012,61(1-2):189-200
In this survey the role of order-convexity in topologies compatible with a preference (i.e a negatively transitive partial order) is considered. Two main issues are highlighted:the (topoiogical) subspaces of preference ordered topological spaces, and the orderability of a topological space 相似文献
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Eliza P. de Jager 《Topology and its Applications》2007,154(10):2117-2126
We show that the infimum of any family of proximally symmetric quasi-uniformities is proximally symmetric, while the supremum of two proximally symmetric quasi-uniformities need not be proximally symmetric. On the other hand, the supremum of any family of transitive quasi-uniformities is transitive, while there are transitive quasi-uniformities whose infimum with their conjugate quasi-uniformity is not transitive. Moreover we present two examples that show that neither the supremum topology nor the infimum topology of two transitive topologies need be transitive. Finally, we prove that several operations one can perform on and between quasi-uniformities preserve the property of having a complement. 相似文献