共查询到20条相似文献,搜索用时 421 毫秒
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This paper shows that some characterizations of the harmonic majorization of the Martin function for domains having smooth
boundaries also hold for cones. 相似文献
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In this paper we show that a positive superfunction on a cone behaves regularly at infinity outside a minimally thin set associated with the stationary Schr(o|¨)dinger operator. 相似文献
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S. Sadiq Basha 《Numerical Functional Analysis & Optimization》2019,40(10):1182-1193
This article explores some new best proximity point theorems for absolute proximal cyclic contractions and dual supreme proximal contractions which are not necessarily continuous. As a consequence of such best proximity point theorems, the famous contraction principle is elicited. 相似文献
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Antonio Laface Luca Ugaglia 《Transactions of the American Mathematical Society》2006,358(12):5485-5500
In this paper we deal with linear systems of through fat points. We consider the behavior of these systems under a cubic Cremona transformation that allows us to produce a class of special systems which we conjecture to be the only ones.
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上证指数收益率分布的拟合 总被引:3,自引:0,他引:3
本文旨在讨论上证指数收益率序列的分布特征 ,通过对上证指数 1 997年 5月 2 3日至 2 0 0 1年 7月1 3日 ,总计 1 0 0 0多个交易日的统计分析 ,发现上证指数收益率的分布具有“尖峰、厚尾”的特性 .我们试图用文献 [1 ]给出 Lévy flight来拟合其分布 ,但结果并不理想 .为此我们提出了一种类似 Weibull分布的函数来拟合上证指数收益率分布 ,模拟结果较好 .同时 ,我们按通常的方法对尾部作了截尾处理 ,以更接近实际数据在尾部表现出来的“厚尾”现象 相似文献
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This work defines and investigates the properties of multiscale Riesz product measures. These are product measures constructed on general locally compact Abelian groups in a process similar to that of the original example of Riesz. The multiscale element of the construction is the use of a general homomorphism of the group in place of the dilation factor. Furthermore, this construction allows for the use of generating functions that are piecewise constant, reminiscent of a wavelet approach, as well as trigonometric polynomials, which is a more classical Fourier approach. Results obtained include the characterization of the mutual absolute continuity or singularity of such Riesz products, in the spirit of Zygmund’s original dichotomy result. In addition, the differences regarding the support properties of measures based on each approach are analyzed and examples are constructed.
Mathematics Subject Classifications (2000) Primary 43A05, 43A45; secondary 43A25, 43A46.John J. Benedetto: Supported in part by NSF-DMS Grant 0139759 (2002-2005) and the General Research Board of the University of Maryland.Ioannis Konstantinidis: Supported in part by DARPA Grant MDA 972011003. 相似文献
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Let B(G) denote the bipartite double cover of a non-bipartite graph G with v≥2 vertices and ? edges. We prove that G is a perfect 2-matching covered graph if and only if B(G) is a 1-extendable graph. Furthermore, we prove that B(G) is a minimally 1-extendable graph if and only if G is a minimally perfect 2-matching covered graph and for each e = xy ∈ E(G), there is an independent set S in G such that |ΓG(S)| = |S| + 1, x ∈S and |ΓG-xy(S) | = |S|. Then, we construct a digraph D from B(G) or G and show that D is a strongly connected digraph if and only if G is a perfect 2-matching covered graph. So we design an algorithm in O(v ? ) time that determines whether G is a perfect 2-matching covered graph or not. 相似文献
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VaR方法在证券市场尖峰、胖尾分布中的实证分析 总被引:2,自引:0,他引:2
标准 Va R方法的假设条件与实际数据之间存在较大的差距 ,而差距是必严重影响 Va R方法的实际应用效果 .为此 ,本文从实际数据的基本特征出发 ,讨论了 Va R方法在尖峰、胖尾分布中的计算公式 ,并使用该计算公式对我国证券市场的实际数据进行了实证分析 .分析结果表明 ,推广的 Va R计算方法对证券市场风险预警有更可靠的揭示作用 . 相似文献
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In this paper we define the class of near-ideal clutters following a similar concept due to Shepherd [Near perfect matrices, Math. Programming 64 (1994) 295-323] for near-perfect graphs. We prove that near-ideal clutters give a polyhedral characterization for minimally nonideal clutters as near-perfect graphs did for minimally imperfect graphs. We characterize near-ideal blockers of graphs as blockers of near-bipartite graphs. We find necessary conditions for a clutter to be near-ideal and sufficient conditions for the clutters satisfying that every minimal vertex cover is minimum. 相似文献
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对球形塑性壳在平头圆柱体冲击下的动力贯穿行为进行了分析.通过引入等度量变换,给出了壳体的变形模态.在此基础上对球壳在平头圆柱体撞击下的贯穿机制进行了分析研究,给出了贯穿模型,由此结合Hamilton原理,导出了运动方程组.采用Runge-Kutta方法求解了该方程组,最后分别给出了贯穿时间-弹体初速度;残余窝陷半径-弹体初速度;贯穿后弹体剩余速度-弹体初速度的关系曲线. 相似文献
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Yan Zheng 《数学学报(英文版)》2010,26(5):923-936
In this article stochastic perturbations of a class of fat solenoidal attractors are considered. We show the robustness of their invariant densities and rates of mixing under the stochastic perturbations by investigating the properties of their transfer operators. 相似文献
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Enumerating Constrained Non-crossing Minimally Rigid Frameworks 总被引:2,自引:1,他引:1
David Avis Naoki Katoh Makoto Ohsaki Ileana Streinu Shin-ichi Tanigawa 《Discrete and Computational Geometry》2008,40(1):31-46
In this paper we present an algorithm for enumerating without repetitions all the non-crossing generically minimally rigid
bar-and-joint frameworks under edge constraints, which we call constrained non-crossing Laman frameworks, on a given set of
n points in the plane. Our algorithm is based on the reverse search paradigm of Avis and Fukuda. It generates each output graph
in O(n
4) time and O(n) space, or, with a slightly different implementation, in O(n
3) time and O(n
2) space. In particular, we obtain that the set of all the constrained non-crossing Laman frameworks on a given point set is
connected by flips which preserve the Laman property.
D. Avis’s research was supported by NSERC and FQRNT grants.
N. Katoh’s, M. Ohsaki’s and S.-i. Tanigawa’s research was supported by NEXT Grant-in-Aid for Scientific Research on priority
areas of New Horizons in Computing.
I. Streinu’s research was supported by NSF grant CCF-0430990 and NSF-DARPA CARGO CCR-0310661. 相似文献
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Konstantin Dyakonov Artur Nicolau 《Transactions of the American Mathematical Society》2007,359(9):4449-4465
We are concerned with interpolation problems in where the values prescribed and the function to be found are both zero-free. More precisely, given a sequence in the unit disk, we ask whether there exists a nontrivial minorant (i.e., a sequence of positive numbers bounded by 1 and tending to 0) such that every interpolation problem has a nonvanishing solution whenever for all . The sequences with this property are completely characterized. Namely, we identify them as `` thin" sequences, a class that arose earlier in Wolff's work on free interpolation in VMO.
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Lynn G. McAlevey Alan F. Stent 《International Journal of Mathematical Education in Science & Technology》2018,49(1):120-130
The treatment of kurtosis in textbooks is both sparse and contradictory with applications rarely discussed. To address this, an easily understood definition of kurtosis is introduced and important applications are demonstrated. Two different approaches to teaching kurtosis are presented based on a financial application. 相似文献