共查询到20条相似文献,搜索用时 109 毫秒
1.
刘钢 《高等学校计算数学学报》1995,17(3):243-251
1 引 言 随着科学技术的发展,各种类型的并行处理计算机已大量出现,为了提高这些机器的实际效率,需要构造与其相适应的并行算法。对于常微分方程初值问题,本文构造了一类带有高阶导数的块隐式单步并行计算公式,该方法可以在多台处理机上进行并行计算,而且具有良好的数值稳定性。本文将给出方法的构造,并且对其收敛性、精度及数值稳定性进行讨论。 2 方法的构造与精度 考虑常微分方程初值问题: 相似文献
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本文讨论了一类并行计算常微分方程初值问题的带有高阶导数的块隐式混合单步方法,这种方法可以在K台处理机上并行进行数值计算,本文对方法的一般性质及收敛性进行了讨论,得知该方法的阶数为2l+1,并且指出当l=1,2时,方法是A-稳定的,最后给出了一个数值例子。 相似文献
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对非线性不适定算子方程,引入一种双参数正则化方法求解,讨论了这种正则化方法解的存在性、稳定性和收敛性. 相似文献
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hybrid逼近算法是一种用多项式逼近有理多项式的有效方法,但是这种算法逼近有时会发散.这样讨论它的收敛性条件就变得弥足重要.在前人工作的基础上研究了重新参数化对有理Bézier曲线hybrid逼近收敛性的影响,在权系数的某些假定下,得到了重新参数化后hybrid逼近收敛的充分条件. 相似文献
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本文讨论区间数据情况下, 指数分布参数的估计\bd 引入了两种叠代方法, 证明了在一定的条件下, 叠代过程的收敛性. 相似文献
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对复Schrdinger场和实Klein-Gordon场相互作用下一类耦合方程组的初边值问题进行了数值研究,提出了一个高效差分格式,该格式非耦合且为半显格式,因此比隐格式具有更快的计算速度,而且便于并行计算;同时,该格式很好地模拟了初边值问题的守恒性质,保证了格式计算的可靠性,从而便于长时间计算.细致讨论了格式的守恒性质,并在先验估计的基础上运用能量方法分析了差分格式的收敛性. 相似文献
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建立了二阶抛物型方程组的一种新数值方法-再生核函数法.利用再生核函数,直接给出了每个离散时间层上近似解的显式表达式,由显式表达式可实现完全并行计算;用能量估计法证明了格式的稳定性及二阶收敛性;给出了一些数值结果. 相似文献
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对复Schr(o)dinger场和实Klein-Gordon场相互作用下一类耦合方程组的初边值问题进行了数值研究,提出了一个高效差分格式,该格式非耦合且为半显格式,因此比隐格式具有更快的计算速度,而且便于并行计算;同时,该格式很好地模拟了初边值问题的守恒性质,保证了格式计算的可靠性,从而便于长时间计算.细致讨论了格式的守恒性质,并在先验估计的基础上运用能量方法分析了差分格式的收敛性. 相似文献
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Cuilian You 《Mathematical and Computer Modelling》2009,49(3-4):482-487
Uncertain variables are measurable functions from uncertainty spaces to the set of real numbers. In this paper, a new kind of convergence, convergence uniformly almost surely (convergence uniformly a.s.), is presented. Then, relations between convergence uniformly almost surely and convergence almost surely (convergence a.s.), convergence in measure, convergence in mean, and convergence in distribution are discussed. 相似文献
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In this paper, the concept of lacunary equi-statistical convergence is introduced and it is shown that lacunary equi-statistical
convergence lies between lacunary statistical pointwise and lacunary statistical uniform convergence. Inclusion relations
between equi-statistical and lacunary equi-statistical convergence are investigated and it is proved that, under some conditions,
lacunary equi-statistical convergence and equi-statistical convergence are equivalent to each other. A Korovkin type approximation
theorem via lacunary equi-statistical convergence is proved. Moreover it is shown that our Korovkin type approximation theorem
is a non-trivial extension of some well-known Korovkin type approximation theorems. Finally the rates of lacunary equi-statistical
convergence by the help of modulus of continuity of positive linear operators are studied.
相似文献
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A convergence structure generalizing the order convergence structure on the set of Hausdorff continuous interval functions
is defined on the set of minimal usco maps. The properties of the obtained convergence space are investigated and essential
links with the pointwise convergence and the order convergence are revealed. The convergence structure can be extended to
a uniform convergence structure so that the convergence space is complete. The important issue of the denseness of the subset
of all continuous functions is also addressed.
相似文献
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广义函数Denjoy积分的收敛性问题 总被引:2,自引:0,他引:2
本文讨论广义函数De njoy积分的收敛性问题.首先给出了广义Denjoy可积函数空间中强收敛、弱收敛、弱~*收敛和广义函数Denjoy积分收敛的关系;证明拟一致收敛是广义函数Denjoy积分收敛的一个充分必要条件;最后指出了Denjoy可积广义函数列弱~*收敛与强收敛等价当且仅当原函数等度连续. 相似文献
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This paper studies resolvent convergence and spectral approximations of sequences of self-adjoint subspaces (relations) in complex Hilbert spaces. Concepts of strong resolvent convergence, norm resolvent convergence, spectral inclusion, and spectral exactness are introduced. Fundamental properties of resolvents of subspaces are studied. By applying these properties, several equivalent and sufficient conditions for convergence of sequences of self-adjoint subspaces in the strong and norm resolvent senses are given. It is shown that a sequence of self-adjoint subspaces is spectrally inclusive under the strong resolvent convergence and spectrally exact under the norm resolvent convergence. A sufficient condition is given for spectral exactness of a sequence of self-adjoint subspaces in an open interval lacking essential spectral points. In addition, criteria are established for spectral inclusion and spectral exactness of a sequence of self-adjoint subspaces that are defined on proper closed subspaces. 相似文献
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Ioannis K. Argyros 《Journal of Applied Mathematics and Computing》1999,6(2):291-304
Affine invariant sufficient conditions are given for two local convergence theorems involving inexact Newton-like methods. The first uses conditions on the first Fréchet-derivative whereas the second theorem employs hypotheses on the second. Radius of convergence as well as rate of convergence results are derived. Results involving superlinear convergence and known to be true for inexact Newton methods are extended here. Moreover, we show that under hypotheses on the second Fréchet-derivative our radius of convergence is larger than the corresponding one in [10]. This allows a wider choice for the initial guess. A numerical example is also provided to show that our radius of convergence is larger than the one in [10]. 相似文献
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Baoding Liu 《Fuzzy Optimization and Decision Making》2003,2(2):87-100
It is well-known that Markov inequality, Chebyshev inequality, Hölder's inequality, and Minkowski inequality are important and useful results in probability theory. This paper presents the analogous inequalities in fuzzy set theory and rough set theory. In addition, sequence convergence plays an extremely important role in the fundamental theory of mathematics. This paper presents four types of convergence concept of fuzzy/rough sequence: convergence almost surely, convergence in credibility/trust, convergence in mean, and convergence in distribution. Some mathematical properties of those new convergence concepts are also given. 相似文献
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References: 《高校应用数学学报(英文版)》2007,22(3):353-365
A local convergence theorem and five semi-local convergence theorems of the secant method are listed in this paper.For every convergence theorem,a convergence ball is respectively introduced,where the hypothesis conditions of the corresponding theorem can be satisfied.Since all of these convergence balls have the same center x~*,they can be viewed as a homocentric ball. Convergence theorems are sorted by the different sizes of various radii of this homocentric ball, and the sorted sequence represents the degree of weakness on the conditions of convergence theorems. 相似文献
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Sanjoy Ghosal 《Applications of Mathematics》2013,58(4):423-437
In this paper the ideas of three types of statistical convergence of a sequence of random variables, namely, statistical convergence in probability, statistical convergence in mean of order r and statistical convergence in distribution are introduced and the interrelation among them is investigated. Also their certain basic properties are studied. 相似文献