共查询到20条相似文献,搜索用时 171 毫秒
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使用半序理论,h-序差和变距离函数的性质,在半序积Banach空间上讨论了一类没有凹凸性的单调算子,得出新的不动点存在唯一性结果,推广了文献中相关的不动点定理. 相似文献
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本文研究有序拓扑向量空间中非线性映照的共鸣定理.对于取值于有序拓扑向量空间中的映照,利用序关系,引入了一类广泛的非线性映照.对于这类非线性映照,应用纲理论,并给出了关于点态序有界蕴涵一致序有界的共鸣定理. 相似文献
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在L-保序算子空间中引入ω-仿紧性,证明它是L-好的推广,它对ω-闭子集遗传、ω-紧的L-保序算子空间和ω-仿紧空间的积空间是仿紧的. 相似文献
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半序方法是研究非线性算子方程问题的主要方法之一.在概率度量空间中引入半序,并且利用半序方法研究了非线性算子的不动点问题,推广了度量空间中序压缩算子的不动点定理,获得若干新的结果. 相似文献
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2005年,张宪在Banach空间中通过其中的锥所定义的半序引进了序压缩算子,证明了几个相应的定理.但是在一般的度量空间中,能否定义序压缩算子,能否得到类似的结论呢?本文在度量空间X中,通过X上的泛函ψ-所定义的半序,引进了ψ--序压缩算子,并且得到了相应的不动点定理. 相似文献
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利用L-fuzzy拓扑向量空间理论^[1]-[6],本文研究了由L-fuzzy线性序同态族所确定的L-fuzzy归纳拓扑后一些性质,给出了由单一Luzzy线性序同态所确定的L-fuzzy归纳拓扑的一个特征刻划,利用此结果,证明了L-fuzzy拓扑向量空间的商空间亦是L-fuzzy拓扑向量空间。 相似文献
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本引进了平移下半连续对应,将定理A由下半连续实值函数的情形推广 移下半连续对应的情形,并在序空间中证明了一个序不等式。 相似文献
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基于迭代函数系统和编码空间的数字图像置乱方法研究 总被引:3,自引:0,他引:3
针对数字图像的安全保密问题 ,本文介绍了一种基于位置空间的数字图像置乱技术 .首先利用伴随于迭代函数系统 ( IFS)的编码空间对数字图像各像素赋予不同编码 ,然后通过对编码的特定置换使各像素位置改变以达到图像置乱的目的 .本文讨论了置乱变换对原图信息分散的规律以及变换的周期性 .理论和实践表明 ,该方法克服了图像信息量大造成的编码上的困难 ,置乱变换后原图的信息按照特定的规律分散开 ,增强了信息隐藏的不可感知性 . 相似文献
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José N. Gomes Henrique F. de Lima Fábio R. dos Santos Marco Antonio L. Velásquez 《Journal of Mathematical Analysis and Applications》2014
We deal with complete linear Weingarten spacelike hypersurfaces immersed in a Lorentzian space form, having two distinct principal curvatures. In this setting, we show that such a spacelike hypersurface must be isometric to a certain isoparametric hypersurface of the ambient space, under suitable restrictions on the values of the mean curvature and of the norm of the traceless part of its second fundamental form. Our approach is based on the use of a Simons type formula related to an appropriated Cheng–Yau modified operator jointly with some generalized maximum principles. 相似文献
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汪贤华 《纯粹数学与应用数学》2013,(4):359-363
θ-连通空间是比连通空间更广泛的一类空间,在前人的研究基础之上得到了局部口一连通空间的充分必要条件,证明了局部θ-连通空间在商映射下是不变的,同时也得到了和空间 α∈AXα与乘积空间Пs∈SX8是局部θ-连通空间的充分必要条件. 相似文献
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The James-Schreier spaces Vp, where 1?p<∞, were recently introduced by Bird and Laustsen (in press) [5] as an amalgamation of James' quasi-reflexive Banach space on the one hand and Schreier's Banach space giving a counterexample to the Banach-Saks property on the other. The purpose of this note is to answer some questions left open in Bird and Laustsen (in press) [5]. Specifically, we prove that (i) the standard Schauder basis for the first James-Schreier space V1 is shrinking, and (ii) any two Schreier or James-Schreier spaces with distinct indices are non-isomorphic. The former of these results implies that V1 does not have Pe?czyński's property (u) and hence does not embed in any Banach space with an unconditional Schauder basis. 相似文献
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利用梯度数引入梯度度量空间的概念,证明了一个梯度赋范线性空间可以诱导一个梯度度量空间.在完备的梯度度量空间框架下,给出了相应的Banach压缩映像原理,并且用实例说明了其合理性. 相似文献
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Over the last few decades several methods have been proposed for handling functional constraints while solving optimization problems using evolutionary algorithms (EAs). However, the presence of equality constraints makes the feasible space very small compared to the entire search space. As a consequence, the handling of equality constraints has long been a difficult issue for evolutionary optimization methods. This paper presents a Hybrid Evolutionary Algorithm (HEA) for solving optimization problems with both equality and inequality constraints. In HEA, we propose a new local search technique with special emphasis on equality constraints. The basic concept of the new technique is to reach a point on the equality constraint from the current position of an individual solution, and then explore on the constraint landscape. We believe this new concept will influence the future research direction for constrained optimization using population based algorithms. The proposed algorithm is tested on a set of standard benchmark problems. The results show that the proposed technique works very well on those benchmark problems. 相似文献
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Bing Ye Wu 《Journal of Mathematical Analysis and Applications》2010,372(1):244-251
We investigate the spacelike hypersurfaces in Lorentzian space forms (n?4) with two distinct non-simple principal curvatures without the assumption that the (high order) mean curvature is constant. We prove that any spacelike hypersurface in Lorentzian space forms with two distinct non-simple principal curvatures is locally conformal to the Riemannian product of two constant curved manifolds. We also obtain some characterizations for hyperbolic cylinders in Lorentzian space forms in terms of the trace free part of the second fundamental form. 相似文献
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Z-P-S空间中的若干概率分析问题 总被引:2,自引:1,他引:1
基于Menger概率线性赋范空间,提出了Z-P-S空间这一新概念,研究了Z-P-S空间(E,F,△)中算子A的固有值与固有元问题,建立了紧连续算子A具有大于1的固有值λ且在■D上存在对应于λ的固有元的四个充分条件. 相似文献