Attribute reduction through the combined approach of Rough Sets(RS)and algebraic topology is an open research topic with significant potential for applications.Several research works have introduced a strong relations...Attribute reduction through the combined approach of Rough Sets(RS)and algebraic topology is an open research topic with significant potential for applications.Several research works have introduced a strong relationship between RS and topology spaces for the attribute reduction problem.However,the mentioned recent methods followed a strategy to construct a new measure for attribute selection.Meanwhile,the strategy for searching for the reduct is still to select each attribute and gradually add it to the reduct.Consequently,those methods tended to be inefficient for high-dimensional datasets.To overcome these challenges,we use the separability property of Hausdorff topology to quickly identify distinguishable attributes,this approach significantly reduces the time for the attribute filtering stage of the algorithm.In addition,we propose the concept of Hausdorff topological homomorphism to construct candidate reducts,this method significantly reduces the number of candidate reducts for the wrapper stage of the algorithm.These are the two main stages that have the most effect on reducing computing time for the attribute reduction of the proposed algorithm,which we call the Cluster Filter Wrapper algorithm based on Hausdorff Topology.Experimental validation on the UCI Machine Learning Repository Data shows that the proposed method achieves efficiency in both the execution time and the size of the reduct.展开更多
本文主要探讨指数函数族中一类特殊参数——非回归参数的Hausdorff维数问题,这一研究是在邱维元关于指数函数族逃逸参数的Hausdorff维数为2的重要发现基础上进行的自然延伸与深化。本文旨在证明,在给定的一个固定区域内,指数函数族中非...本文主要探讨指数函数族中一类特殊参数——非回归参数的Hausdorff维数问题,这一研究是在邱维元关于指数函数族逃逸参数的Hausdorff维数为2的重要发现基础上进行的自然延伸与深化。本文旨在证明,在给定的一个固定区域内,指数函数族中非回归且非逃逸参数的集合具有的Hausdorff维数严格小于某个给定的正数。This paper primarily delves into the Hausdorff dimension of a special class of parameters within the exponential family—the non-recurrent parameters. This investigation constitutes a natural extension and deepening of Qiu’s seminal finding that the Hausdorff dimension of escaping parameters of the exponential family is 2. The objective of this paper is to prove that, within a given fixed region, the Hausdorff dimension of the set of non-escaping non-recurrent parameters in the exponential function family is strictly less than a specified positive number.展开更多
Letτbe a generalized Thue-Morse substitution on a two-letter alphabet{a,b}:τ(a)=ambm,τ(b)=bmam for the integer m≥2.Letξbe a sequence in{a,b}Z that is generated byτ.We study the one-dimensional Schr?dinger operat...Letτbe a generalized Thue-Morse substitution on a two-letter alphabet{a,b}:τ(a)=ambm,τ(b)=bmam for the integer m≥2.Letξbe a sequence in{a,b}Z that is generated byτ.We study the one-dimensional Schr?dinger operator Hm,λon l2(Z)with a potential given by v(n)=λVξ(n),whereλ>0 is the coupling and Vξ(n)=1(Vξ(n)=-1)ifξ(n)=a(ξ(n)=b).LetΛ2=2,and for m>2,letΛm=m if m≡0 mod 4;letΛm=m-3 if m≡1 mod 4;letΛm=m-2if m≡2 mod 4;letΛm=m-1 if m≡3 mod 4.We show that the Hausdorff dimension of the spectrumσ(Hm,λ)satisfies that dimHσ(Hm,λ)>logΛm/(log 64m+4).It is interesting to see that dimHσσ(Hm,λ)tends to 1 as m tends to infinity.展开更多
基金funded by Vietnam National Foundation for Science and Technology Development(NAFOSTED)under Grant Number 102.05-2021.10.
文摘Attribute reduction through the combined approach of Rough Sets(RS)and algebraic topology is an open research topic with significant potential for applications.Several research works have introduced a strong relationship between RS and topology spaces for the attribute reduction problem.However,the mentioned recent methods followed a strategy to construct a new measure for attribute selection.Meanwhile,the strategy for searching for the reduct is still to select each attribute and gradually add it to the reduct.Consequently,those methods tended to be inefficient for high-dimensional datasets.To overcome these challenges,we use the separability property of Hausdorff topology to quickly identify distinguishable attributes,this approach significantly reduces the time for the attribute filtering stage of the algorithm.In addition,we propose the concept of Hausdorff topological homomorphism to construct candidate reducts,this method significantly reduces the number of candidate reducts for the wrapper stage of the algorithm.These are the two main stages that have the most effect on reducing computing time for the attribute reduction of the proposed algorithm,which we call the Cluster Filter Wrapper algorithm based on Hausdorff Topology.Experimental validation on the UCI Machine Learning Repository Data shows that the proposed method achieves efficiency in both the execution time and the size of the reduct.
文摘本文主要探讨指数函数族中一类特殊参数——非回归参数的Hausdorff维数问题,这一研究是在邱维元关于指数函数族逃逸参数的Hausdorff维数为2的重要发现基础上进行的自然延伸与深化。本文旨在证明,在给定的一个固定区域内,指数函数族中非回归且非逃逸参数的集合具有的Hausdorff维数严格小于某个给定的正数。This paper primarily delves into the Hausdorff dimension of a special class of parameters within the exponential family—the non-recurrent parameters. This investigation constitutes a natural extension and deepening of Qiu’s seminal finding that the Hausdorff dimension of escaping parameters of the exponential family is 2. The objective of this paper is to prove that, within a given fixed region, the Hausdorff dimension of the set of non-escaping non-recurrent parameters in the exponential function family is strictly less than a specified positive number.
基金the Natural Science Foundation of Xinjiang Uygur Autonomous Region of China“Function spaces adapted to multi-level anisotropic ellipsoid covers and the boundedness of related operators”(2020D01C048)the National Natural Science Foundation of the People’s Republic of China“Real-variable theory of variable exponential functions on anisotropic Euclidean spaces and its applications”(12261083).
基金supported by the National Natural ScienceFoundation of China(11871098)。
文摘Letτbe a generalized Thue-Morse substitution on a two-letter alphabet{a,b}:τ(a)=ambm,τ(b)=bmam for the integer m≥2.Letξbe a sequence in{a,b}Z that is generated byτ.We study the one-dimensional Schr?dinger operator Hm,λon l2(Z)with a potential given by v(n)=λVξ(n),whereλ>0 is the coupling and Vξ(n)=1(Vξ(n)=-1)ifξ(n)=a(ξ(n)=b).LetΛ2=2,and for m>2,letΛm=m if m≡0 mod 4;letΛm=m-3 if m≡1 mod 4;letΛm=m-2if m≡2 mod 4;letΛm=m-1 if m≡3 mod 4.We show that the Hausdorff dimension of the spectrumσ(Hm,λ)satisfies that dimHσ(Hm,λ)>logΛm/(log 64m+4).It is interesting to see that dimHσσ(Hm,λ)tends to 1 as m tends to infinity.
