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4连通图的可去边与4连通图的构造 总被引:2,自引:0,他引:2
本文引进了4连通图的可去边的概念,,并证明了4连通图G中不存在可去边的充要条件是G=C5或C6,同时给出了n阶4连通图的一个新的构造方法. 相似文献
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本文提出了一个试探函数不满足divν=0的定常Stokes方程的窄边四边形有限元法,利用窄边四边形等参有限元插值定理和Falk的思想,得到了H^1(Ω)模误差的最优收敛估计阶O(h)。 相似文献
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本文讨论ut-△u=-h2g(u)在Rubin边值条件下初边值问题正解的存在性与Thiele模量h间的关系,这里g(u)~u-p(P∈(0,1));同时考察当t→+∞时其正解与相应椭园方程之正解的关系. 相似文献
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使用“δ函数”定义离散型随机变量的密度函数,寻求离散型随机变量与连续型随机变量的统一处理方法.基于离散型随机变量密度函数的定义.其一维随机变量函数的密度函数以及多维随机变量的边缘密度等,均可直接利用连续型随机变量的相关结论. 相似文献
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本文利用Frobenius-Nirenberg定理,以及μ-全纯函数满足Hartogs现象这样的性质,证明了关于μ-全纯函数的契边定理. 相似文献
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本文利用Frobenius-Nirenberg定理,以及μ-全纯函数满足Hartogs现象这样的性质,证明了关于μ-全纯函数的契边定理。 相似文献
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1977年, Myerson建立了以图作为合作结构的可转移效用博弈模型(也称图博弈), 并提出了一个分配规则, 也即"Myerson 值", 它推广了著名的Shapley值. 该模型假定每个连通集合(通过边直接或间接内部相连的参与者集合)才能形成可行的合作联盟而取得相应的收益, 而不考虑连通集合的具体结构. 引入图的局部边密度来度量每个连通集合中各成员之间联系的紧密程度, 即以该连通集合的导出子图的边密度来作为他们的收益系数, 并由此定义了具有边密度的Myerson值, 证明了具有边密度的Myerson值可以由"边密度分支有效性"和"公平性"来唯一确定. 相似文献
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模糊密度随机变量的数学描述 总被引:8,自引:2,他引:6
研究了由于概率密度函数的模糊性而引起的模糊概率随机变量问题。给出了区间密度函数、模糊密度函数、模糊密度随机变量及其分布函数和模糊密度随机变量的模糊数学期望、模糊方差等基本概念及定义和计算方法,并证明了有关定理。 相似文献
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In this paper, we use natural gradient algorithm to control the shape of the conditional output probability density function for the stochastic distribution systems from the viewpoint of information geometry. The considered system here is of multi-input and single output with an output feedback and a stochastic noise. Based on the assumption that the probability density function of the stochastic noise is known, we obtain the conditional output probability density function whose shape is only determined by the control input vector under the condition that the output feedback is known at any sample time. The set of all the conditional output probability density functions forms a statistical manifold (M), and the control input vector and the output feedback are considered as the coordinate system. The Kullback divergence acts as the distance between the conditional output probability density function and the target probability density function. Thus, an iterative formula for the control input vector is proposed in the sense of information geometry. Meanwhile, we consider the convergence of the presented algorithm. At last, an illustrative example is utilized to demonstrate the effectiveness of the algorithm. 相似文献
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This paper studies the distribution of finite-time ruin quantities. It gives the probability mass function of finite time number of claims, and find the distribution function of aggregate claims by using discretise method and compared with exact distribution function, which shows that the approximation works very well. In addition, by applying decomposition for density function, it gives the explicit expression for joint density of ruin time and deficit at ruin. 相似文献
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??This paper studies the distribution of finite-time ruin quantities. It gives the probability mass function of finite time number of claims, and find the distribution function of aggregate claims by using discretise method and compared with exact distribution function, which shows that the approximation works very well. In addition, by applying decomposition for density function, it gives the explicit expression for joint density of ruin time and deficit at ruin. 相似文献
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讨论n个受柔性边界条件约束的随机变量的概率分布.理论解显示其概率密度函数随变量值增大而减小,当n趋於无穷大时收敛于Delta函数.在有序统计的理论框架下,同时得到最小值分布的解析解. 相似文献
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We investigate a model of dynamic recrystallization in polycrystalline materials. A probability distribution function is introduced to characterize the state of individual grains by grain size and dislocation density. Specifying free energy and dissipation within the polycrystalline aggregate we are able to derive an evolution equation for the probability density function via a thermodynamic extremum principle. Once the distribution function is known macroscopic quantities like average strain and stress can be calculated. For distribution functions which are constant in time, describing a state of dynamic equilibrium, we obtain a partial differential equation in parameter space which we solve using a marching algorithm. Numerical results are presented and their physical interpretation is given. (© 2013 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim) 相似文献
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In this paper we obtain closed expressions for the probability distribution function of aggregated risks with multivariate dependent Pareto distributions. We work with the dependent multivariate Pareto type II proposed by Arnold (1983, 2015), which is widely used in insurance and risk analysis. We begin with an individual risk model, where the probability density function corresponds to a second kind beta distribution, obtaining the VaR, TVaR and several other tail risk measures. Then, we consider a collective risk model based on dependence, where several general properties are studied. We study in detail some relevant collective models with Poisson, negative binomial and logarithmic distributions as primary distributions. In the collective Pareto–Poisson model, the probability density function is a function of the Kummer confluent hypergeometric function, and the density of the Pareto–negative binomial is a function of the Gauss hypergeometric function. Using data based on one-year vehicle insurance policies taken out in 2004–2005 (Jong and Heller, 2008) we conclude that our collective dependent models outperform other collective models considered in the actuarial literature in terms of AIC and CAIC statistics. 相似文献