共查询到20条相似文献,搜索用时 250 毫秒
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研究了广义凸Fuzzy集和广义反凸Fuzzy集以及它们的性质。通过将凸Fuzzy集和E-凸集相结合,提出了一种新的广义凸Fuzzy集———E-凸Fuzzy集,使得凸Fuzzy集成为它的特例,并对E-凸Fuzzy集的性质进行了初步研究。然后,类似地,通过将反凸Fuzzy集和E-凸集相结合,提出了一种新的广义反凸Fuzzy集———E-反凸Fuzzy集,使得反凸Fuzzy集成为它的特例,并对E-反凸Fuzzy集的性质进行了初步研究。 相似文献
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作为集合凸性概念的一种推广以及统一凸性与近似(nearly)凸性等概念的一种尝试, 本文引入集合$\varOmega$-凸性的概念,
并对$\varOmega$-凸集合的性质进行初步的研究. 另外, 本文还研究了一些常见变换与集合运算的保$\varOmega$-凸性质. 相似文献
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关于k极凸空间的几点注记 总被引:1,自引:1,他引:0
本文证明了k极凸是严格介于冼军和胡长松的k极凸性和何仁义的k极凸性之间的一种新凸性.利用k极凸空间的概念,得到了k极凸的性质以及与其它凸性之间的蕴涵关系,完善了k极光滑及其对偶空间的研究. 相似文献
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本文研究向量优化问题在严有效解意义下的最优性条件.在局部凸Hausdorff拓扑线性空间中.在近似锥一次类凸假设下,利用凸集分离定理得到了最优性必要条件.借助Gateaux导数引进了几种新的凸性,在新的凸性假设下得到了最优性充分条件. 相似文献
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本文提出了一种计算带约束不可微凸规划问题的算法。这是一种利用有关函数的次梯度的可行方向法,它也可以作为[2]中给出的无约束bundle方法在带有不可微凸的约束情形下的推广。本文给出了算法收敛性的证明。对于求解本算法中所用到的计算多面体凸锥与凸多面体间最短距离这个子问题,也给出了一个收敛性得以保证的方法。 相似文献
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本文在质量评估工作中研究了一种评估模型,其y和α都是可变的,并带有线性凸约束.文章研究了模型的解,讨论了解的性质.最后文章利用凸集间的交互投影提出了一种迭代解法. 相似文献
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In this article the existence of the convex extension of convex set valued map is considered. Conditions are obtained, based on the notion of the derivative of set valued maps, which guarantee the existence of convex extension. The conditions are given, when the convex set valued map has no convex extension. The convex set valued map is specified, which is the maximal convex extension of the given convex set valued map and includes all other convex extensions. The connection between Lipschitz continuity and existence of convex extension of the given convex set valued map is studied. 相似文献
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主要研究了两类近似凸集的关系和性质.首先,举例说明两类近似凸集没有相互包含关系.其次,在近似凸集(nearly convex)条件下,证明了在一定条件下函数上图是近似凸集与凸集的等价关系.同时,考虑了近似凸函数与函数上图是近似凸集的等价刻画、近似凸函数与函数水平集是近似凸集的必要性,并用例子说明近似凸函数与函数水平集是近似凸集的充分性不成立.最后,基于近似凸函数和拟凸函数的概念,给出了近似拟凸函数的概念并研究了近似拟凸函数与水平集是近似凸集的等价刻画. 相似文献
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Patrick N. Dowling 《Journal of Mathematical Analysis and Applications》2003,288(2):540-543
The ψ-direct sum of Banach spaces is strictly convex (respectively, uniformly convex, locally uniformly convex, uniformly convex in every direction) if each of the Banach spaces are strictly convex (respectively, uniformly convex, locally uniformly convex, uniformly convex in every direction) and the corresponding ψ-norm is strictly convex. 相似文献
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After a brief survey on condition numbers for linear systems of equalities, we analyse error bounds for convex functions and convex sets. The canonical representation of a convex set is defined. Other representations of a convex set by a convex function are compared with the canonical representation. Then, condition numbers are introduced for convex sets and their convex representations. 相似文献
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Marek Cezary Zdun 《Journal of Difference Equations and Applications》2018,24(5):773-783
AbstractA function f is said to be iteratively convex if f possesses convex iterative roots of all orders. We give several constructions of iteratively convex diffeomorphisms and explain the phenomenon that the non-existence of convex iterative roots is a typical property of convex functions. We show also that a slight perturbation of iteratively convex functions causes loss of iterative convexity. However, every convex function can be approximate by iteratively convex functions. 相似文献
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关于K—极凸Banach空间 总被引:3,自引:0,他引:3
何仁义 《纯粹数学与应用数学》1998,14(2):19-22
引进K-极凸Banach空间,证明了XK-极凸当且仅当X自反、K-严格凸且有(H)性质,得到了K-极凸空间的一些性质,并讨论了K-极凸与K-K-强光滑、K-一致凸及完全K-凸的关系。 相似文献
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Generalized polyhedral convex sets, generalized polyhedral convex functions on locally convex Hausdorff topological vector spaces, and the related constructions such as sum of sets, sum of functions, directional derivative, infimal convolution, normal cone, conjugate function, subdifferential are studied thoroughly in this paper. Among other things, we show how a generalized polyhedral convex set can be characterized through the finiteness of the number of its faces. In addition, it is proved that the infimal convolution of a generalized polyhedral convex function and a polyhedral convex function is a polyhedral convex function. The obtained results can be applied to scalar optimization problems described by generalized polyhedral convex sets and generalized polyhedral convex functions. 相似文献
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In this paper, we prove that strongly convex space and almost locally uniformly rotund space, very convex space and weakly almost locally uniformly rotund space are respectively equivalent. We also investigate a few properties of k-strongly convex space and k-very convex space, and discuss the applications of strongly convex space and very convex space in approximation theory. 相似文献