共查询到20条相似文献,搜索用时 46 毫秒
1.
本文给出了仅用元的阶之集对二元域上小阶线性群及其自同构群的刻画.指出并纠正了文[5]中的错误. 相似文献
2.
一般KdV方程的群分析 总被引:1,自引:1,他引:0
潘祖梁 《高校应用数学学报(A辑)》1993,(2):169-175
对于一般KdV方程(0,1)给出统一的相似约化,利用所得的三参数Lie点变换群,从已知解产生新的单参数解族,对于非可积情形(n=2,4,σ=-1)给出一系列的精确解或解的渐近态。 相似文献
3.
本文讨论了如下一类线性errors-in-variables模型——多元线性结构关系模型β′xk+α=0,ξk=xk+εk.{k=1,2,…,n.其中,{xk:k=1,2,…,n}为一组i.i.d.的m维随机向量,{εk:k=1,2,…,n}是i.i.d.的随机误差,E(ε1)=0,Var(ε1)=σ2Im.且{xk:k=1,2,…,n}与{εk:k=1,2,…,n}相互独立.在一些条件下,我们证明了估计量β,α,σ2的强相合性、唯一性,并给出了估计量的收敛速度为o(n-1-1q),这里q∈[1,2).对于E(x1)u1和Var(x1)Vx的估计也得出了同样的结果 相似文献
4.
白中治 《高等学校计算数学学报(英文版)》1996,(2)
Under suitable conditions,the monotone convergence about the projected iteration method for solving linear complementarity problem is proved and the influence of the involved parameter matrix on the convergence rate of this method is investigated. 相似文献
5.
《Quaestiones Mathematicae》2013,36(4):399-408
Abstract Let A be a unitary Banach algebra and let B be a closed subalgebra of A that contains the unit. For an element of B we show in this note how both the singular and exponential spectrum depends on the algebra. 相似文献
6.
关于二次规划问题分段线性同伦算法的改进 总被引:1,自引:0,他引:1
杨冰 《高校应用数学学报(A辑)》1995,(4):417-424
本文利用Cholesky分解,Gauss消去等技术和定义适当的同伦映射,将关于二次规划问题的分段线性同伦算法加以改进,改进后的算法,对于严格凸二次规划来说,计算效率与Goldfarb-Idnani的对偶法相当。 相似文献
7.
本文讨论了两类特殊环上的理想双同志门限体制.利用门限体制的完善性及同态性,证明了以剩余类环Zn,和Galois环GR(p^e,n)为密钥空间的理想双同志(t,ι)-门限体制是平凡的. 相似文献
8.
林路 《数学的实践与认识》1997,(2)
在线性模型中,对于回归系数的岭估计和广义岭估计,本文给出了选择岭参数的条件,在此条件下,岭估计和广义岭估计不仅能改善LS估计,而且增加试验数据时,它们的均方误差都会减少。同时,本文将增加试验数据换成增加附加信息,从而讨论了附加信息对混合岭估计和混合广义岭估计的影响问题。 相似文献
9.
线性流形上D对称矩阵反问题的最小二乘解 总被引:3,自引:0,他引:3
本研究了线性流形上D对称矩阵反问的最小二乘解及其逼近问题,给出了最小二乘解的一般表达式,并就该问题的特殊情况-矩阵反问题,获得了有解的充分必要条件,并在有解的条件下得到了解的一段表达式。 相似文献
10.
Zhong-zhi Bai 《计算数学(英文版)》2002,20(6):561-574
We study the numerical behaviours of the relaxed asynchronous multisplitting methods for the linear complementarity problems by solving some typical problems from practical applications on a real multiprocessor system. Numerical results show that the parallel multisplitting relaxation methods always perform much better than the corresponding sequential alternatives, and that the asynchronous multisplitting relaxation methods often outperform their corresponding synchronous counterparts. Moreover, the two-sweep relaxed multisplitting methods have better convergence properties than their corresponding one-sweep relaxed ones in the sense that they have larger convergence domains and faster convergence speeds. Hence, the asynchronous multisplitting unsymmetric relaxation iterations should be the methods of choice for solving the large sparse linear complementarity problems in the parallel computing environments. 相似文献
11.
SangDongKim ByeongChunShin SeokchanKim GyungsooWoo 《计算数学(英文版)》2003,21(6):689-702
This paper studies the discrete minus one norm least-squares methods for the stress formulation of pure displacement linear elasticity in two dimensions. The proposed leastsquares functional is defined as the sum of the L^2 -and H^-l -norms of the residual equations weighted appropriately. The minus one norm in the functional is replaced by the discrete minus one norm and then the discrete minus one norm least-squares methods are analyzed with various numerical results focusing on the finite element accuracy and multigrid convergence performances. 相似文献
12.
实对称矩阵广义特征值反问题 总被引:10,自引:0,他引:10
戴华 《高校应用数学学报(A辑)》1992,7(2):167-176
本文研究如下实对称矩阵广义特征值反问题: 问题IGEP,给定X∈R~(n×m),1=diag(λ_II_k_I,…,λ_pI_k_p)∈R~(n×m),并且λ_I,…,λ_p互异,sum from i=1 to p(k_i=m,求K,M∈SR~(n×n),或K∈SR~(n×n),M∈SR_0~(n×m),或K,M∈SR_0~(n×n),或K∈SR~(n×n),M∈SR_+~(n×n),或K∈SR_0~(n×n),M∈SR_+~(n×n),或K,M∈SR_+~(n×m), (Ⅰ)使得 KX=MXA, (Ⅱ)使得 X~TMX=I_m,KX=MXA,其中SR~(n×n)={A∈R~(n×n)|A~T=A},SR_0~(n×n)={A∈SR~(n×n)|X~TAX≥0,X∈R~n},SR_+~(n×n)={A∈SR~(n×n)|X~TAX>0,X∈R~n,X≠0}. 利用矩阵X的奇异值分解和正交三角分解,我们给出了上述问题的解的表达式. 相似文献
13.
14.
Hong-jiong Tian 《计算数学(英文版)》2001,(2)
1. IntroductionFor a large class of electrical ~ks containing IOssless transmission lines the describingequations can be reduced to a system of neutral differential equations.This paper deals with the numerical solution of initial value problems for syste… 相似文献
15.
设u是Hilbert空间上的σ-弱闭算子空间,称u具有性质(P),如果u中秩-算子生成的子空间在u中是σ-弱稠密的,称u具有扩张性质(P),如果u以及包含u的每个σ-弱闭子空间都具有性质(P),本文研究了性质(P)和扩张性质(P),给出了它们的等从描述。 相似文献
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17.
H. S. Hoang R. Baraille O. Talagrand P. DeMey 《Applied Mathematics and Optimization》2001,43(3):203-220
This paper extends the results of Masreliez [8] on the design of non-Gaussian estimators for a more general class of the
parameter estimation problem when the system state and the observation noise may be dependent and non-Gaussian simultaneously.
It is shown that the proposed non-Gaussian algorithms can approximate with high precision the minimum mean square estimator.
Application of the approach to the design of different optimal (and stable) estimation algorithms is illustrated. The efficiency
of the proposed algorithms is tested in some simulation experiments.
Accepted 5 September 2000. Online publication 26 February 2001. 相似文献
18.
M.K. Grammatikopulos G. Kvinikadze 《Journal of Mathematical Analysis and Applications》2003,284(1):294-314
In the paper the general linear functional differential equation with several distributed deviations is considered. Sufficient conditions for the equation to have Property A (see Definition 1.2 below) are established. The obtained results are new even for Eq. (1.4). 相似文献
19.
本文用MoritaContext的方法得到域上余FrobeniusHopf代数H与H-余摸代数A的Smash积A#H*rat是中心单代数的条件:若A/ACoH是H-Galois扩张,且ACoH是中心单代数,则A#H*rat也是中心单代数,特别地,若ACoHk,则A#H*rat是中心单代数,且为k-空间A上线性变换稠密环.作为推论给出H#H*rat是本原中心单代数新的证明. 相似文献
20.
Cartesian product (CP) files have been shown to be very effective for partial match retrieval. Further the Disk Modulo (DM) allocation method has been shown to be a simple and effective method for allocating CP files onto multiple independently accessible disks to further facilitate partial match retrieval. In this paper, a useful criterion for the DM method to be the best allocation method for a given CP file is presented. The presented criterion is much more general than that suggested previously which makes the DM allocation method much more applicable for real applications. 相似文献