共查询到19条相似文献,搜索用时 171 毫秒
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k半层空间是层空间与N空间的共同推广,本文综述k半层空间的研究进展,介绍k半层空间的刻画、性质及其推广,给出一些相关问题,供进一步研究. 相似文献
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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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半空间中一类次调和函数的增长性质 总被引:5,自引:5,他引:0
在Rn的半空间{x∈Rn,xn>0}中,得到了具有Dirichlet数据的Poisson积分在自然的积分收敛条件下满足增长性质u(x)=o(|x|),这里|x|→∞,这一性质对于半空间中满足一定条件的次调和函数仍然成立.该结果把复平面C中解析函数的增长性质推广到了n-维Euclidean半空间,并且推广了n-维Euclidean半空间中某些经典的结果. 相似文献
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给出了k-空间类中具有CF性质的k-半分层空间的一些刻画,证明了k-空间X是具有CF性质的k-半分层空间当且仅当X具有σ-CF闭伪基(闭k-网).作为这个结果的一个应用,本文部分正面回答了k-半分层空间的两个问题. 相似文献
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具有σ局部有限sn网的正则空间称为sn可度量化空间,本文讨论了k半层空间的可扩性质,证明了序列覆盖的闭映射保持sn可度量化空间,同时给出与sn可度量化空间的映射性质相关的几个例子。 相似文献
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本文证明了n-维(n≥2)Euclidean空间的上半空间中Poisson积分在无穷远点处的增长性质.同时将这个性质推广到次调和函数中去,其概括了解析函数和调和函数的增长性质. 相似文献
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本文研究包含有一根部份嵌入的迴转轴的半空间的性质.不用知道一给定的嵌入的轴的扭转问题的精确解,这些性质能指出此半空间的位移或应力场的某些特点并且有时可以用来检查数值解.文中给出嵌入半空间的受扭的刚性圆柱的轴的表面上的正确的应力分布的检查的例子. 相似文献
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Tahar Zamène Boulmezaoud Nabil Kerdid 《Mathematical Methods in the Applied Sciences》2016,39(2):280-288
J. Banasiak In this paper, we deal with spectral properties of a weighted Laplacian in the half‐space when a Dirichlet or a Neumann boundary condition is imposed. After proving that the spectrum is discrete under suitable assumptions, we give explicit formulae of eigenvalues and eigenfunctions in a specific case. In particular, the obtained eigenfunctions are rational or pseudo‐rational and have remarkable orthogonality properties. These results suggest the use of the discovered functions for approximating solutions of elliptic problems in the half‐space. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
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《Mathematische Nachrichten》2017,290(17-18):2725-2739
In this paper we introduce and study the fractional Hardy spaces of the half space and of the unit ball in the quaternionic setting. In particular, we discuss their properties of invariance and of factorization in terms of functions in the Hardy space of the half space in the first case, and in terms of a suitable reproducing kernel Hilbert space in the case of the unit ball. 相似文献
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Brigitte Lucquin‐Desreux 《Mathematical Methods in the Applied Sciences》2003,26(5):389-412
This paper deals with the mathematical analysis of the linear stationary Fokker–Planck equation in a half‐space (also called ‘Milne’ problem), in presence of an external electrostatic force field. We prove existence, uniqueness and asymptotic properties of the solution. Copyright © 2003 John Wiley & Sons, Ltd. 相似文献
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In this article, we consider a measure in Wiener space, induced by the sum of measures associated with an uncountable set of positive real numbers, and investigate the basic properties of this measure. We apply this measure to the various theories related to Wiener space. In particular, we can obtain a partial answer to Johnson and Skoug's open problems, raised in their 1979 paper. Moreover, we can improve and clarify some theories related to Wiener space.
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V. A. Gerasik 《Journal of Mathematical Sciences》2001,107(6):4425-4431
The nonstationary propagation of waves on the surface of an elastic half space from a deep expansion source (model of an explosion in a half space) is examined. Exact solutions are obtained in the form of integrals with finite limits and the general solution is calculated. Algebraic expressions are obtained for the Rayleigh wave. The transition of Rayleigh waves at the surface of the half space is studied. Calculations of Rayleigh waves from discontinuous pulsed sources are presented. 相似文献
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J.W. Cannon 《Topology and its Applications》2006,153(14):2648-2672
We study here a number of questions raised by examining the fundamental groups of complicated one-dimensional spaces. The first half of the paper considers one-dimensional spaces as such. The second half proves related results for general spaces that are needed in the first half but have independent interest. Among the results we prove are the theorem that the fundamental group of a separable, connected, locally path connected, one-dimensional metric space is free if and only if it is countable if and only if the space has a universal cover and the theorem that the fundamental group of a compact, one-dimensional, connected metric space embeds in an inverse limit of finitely generated free groups and is shape injective. 相似文献
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Fengwen AN 《数学年刊B辑(英文版)》2011,32(1):139-160
The author first introduces the notion of affine structures on a ringed space and then obtains several related properties.
Affine structures on a ringed space, arising from complex analytical spaces of algebraic schemes, behave like differential
structures on a smooth manifold. 相似文献