共查询到20条相似文献,搜索用时 0 毫秒
1.
AdmissibleLinearEstimationinLinearModelsLuChangyu(鹿长余)andZhuXianhai(朱显海)(DepartmentofMathematics,NortheastNormalUniversity,Ch... 相似文献
2.
This paper considers the estimation of f′θ, β′cβ and their linear combination by quadratic estimates in variance components model. The solution to the LaMotte's Problem (see[1]) and some interesting results on the admissible or inadmissible estimation of quantities involving θ and β are presented. 相似文献
3.
Let F be an infinite field of characteristic ≠?2. We study the ?-polynomial identities of the ?-minimal algebra R?=?UT ?(F?⊕?F, F). We describe the generators of T ?(R) and a linear basis of the relatively free algebra of R. When char.F?=?0, these results allow us to provide a complete list of polynomials generating irreducible GL × GL-modules decomposing the proper part of the relatively free algebra of R. Finally, the ?-codimension sequence of R is explicitly computed. 相似文献
4.
The Partial Stability for Linear Discrete Systems 总被引:1,自引:0,他引:1
《数学研究与评论》1989,(4)
In this paper, we study the partial stability of linear discrete systems by means of Liapunov's functions of quadratic form. We obtain a necessary and sufficient condition for the system being stable with respect to part of variables and generalize Liapunov's equation to the partial stability of linear discrete systems. A method of constructing Liapunov's function of quadratic form for the stability of the systems is given. 相似文献
5.
Li Ning JIANG Mao Zheng GUO 《数学学报(英文版)》2005,21(4):673-680
Suppose that G is a finite group and D(G) the double algebra of G. For a given subgroup H of G, there is a sub-Hopf algebra D(G; H) of D(G). This paper gives the concrete construction of a D(G; H)-invariant subspace AH in field algebra of G-spin model and proves that if H is a normal subgroup of G, then AH is Galois closed. 相似文献
6.
ThePeriodicSolutionsofPartialVariablesforAnClassofLinearPeriodicSystems¥WangHut;LuMenglin(HenanUniversity)(ZhengzhouLightIndu... 相似文献
7.
MixedEstimationsandBayesEstimationoftheRegressionCoefficientinMultivariateLinearModel¥HuangYangxin(黄养新)(WuhanUniversityofTech... 相似文献
8.
XuanyunQin WeipingFeng 《数学理论与应用》2002,22(2):31-33
In this paper,employing the geometric criteria of stabilty we obtain some stable results of linear differential equations with impulsive effects. 相似文献
9.
F. Khellat 《Journal of Optimization Theory and Applications》2009,143(1):107-121
This paper introduces the application of linear Legendre multiwavelets to the optimal control synthesis for linear time-delayed
systems. Based on some useful properties of linear Legendre multiwavelets, integration, product and delay operational matrices
are proposed to solve the linear time-delayed systems first. Then, a quadratic cost functional is approximated by those properties.
By using Lagrange multipliers, the quadratic cost functional is minimized subject to the solution of the linear time-delayed
system and an explicit formula for the optimal control is obtained. The effectiveness of the method and accuracy of the solution
are shown in comparison with some other methods by illustrative examples. 相似文献
10.
Margherita Barile 《代数通讯》2013,41(12):4540-4556
We present some examples of squarefree monomial ideals whose arithmetical rank can be computed using linear algebraic considerations. 相似文献
11.
Inthispaper,allgraphsarefinite,simpleandundirected.Forarealnumberx,[x]istheleastintegernotlessthanx.LetG=(V(G),E(G))beagraph.Weuse△(G)andδ(G)todenotethemaximum(vertex)degreeandtheminimum(vertex)degreeofG.Letw(G)=min{d(u) d(v):uv∈E(G)}.Thegirthg(G)ofGistheminimumlengthofcycles.Thedensitymad(G)ofagraphGisthemaximumvalueof2|E(H)|/|V(H)|takenoverallsubgraphsHofG.Ifv6V(G),N(v)denotesthesetofvenicesadjacenttov,thedegreedG(v)isING(v)landNc(v)={aluEN(v)andd(u)=k}.Avertexofdegreekisc… 相似文献
12.
Jianqiang Feng 《数学研究通讯:英文版》2014,30(1):51-59
In this article, we study the Lie supertriple system (LSTS) $T$ over a field$\mathbb{K}$ admitting a nondegenerate invariant supersymmetric bilinear form (call such a $T$ metrisable). We give the definition of $T^∗_ω$-extension of an LSTS $T$, prove a necessary
and sufficient condition for a metrised LSTS ($T$, $ϕ$) to be isometric to a $T^∗$-extension
of some LSTS, and determine when two $T^∗$-extensions of an LSTS are "same", i.e.,
they are equivalent or isometrically equivalent. 相似文献
13.
Serre’s reduction aims at reducing the number of unknowns and equations of a linear functional system. Finding an equivalent presentation of a linear functional system containing fewer equations and fewer unknowns can generally simplify both the study of the structural properties of the linear functional system and of different numerical analysis issues, and it can sometimes help solving the linear functional system. The purpose of this paper is to present a constructive approach to Serre’s reduction for determined and underdetermined linear functional systems. 相似文献
14.
《Journal of Complexity》2002,18(1):210-223
In time-domain identification of linear systems the aim is to estimate the impulse response or transfer function of a linear system to within a given tolerance using a finite number of noisy observations of the output. Whether this is possible depends on the model set, that is, a given set to which the system is assumed to belong a priori. We give necessary and sufficient conditions on the model set to ensure that such identification is possible in the continuous-time case. 相似文献
15.
Wei Li Peng-cheng XuBeijing University of Chemical Technology & Academy of Mathematics Systems Science ChineseAcademy of Sciences Beijing ChinaAcademy of Mathematics Systems Science Chinese Academy of Sciences Beijing China 《应用数学学报(英文版)》2003,(4)
Abstract The existence of Silnikov's orbits in a four-dimensional dynamical system is discussed.The exis-tence of Silnikov's orbit resulting in chaotic dynamics is established by the fiber structure of invariant manifoldand high-dimensional Melnikov method.Numerical simulations are given to demonstrate the theoretical analysis. 相似文献
16.
Zhe DONG 《数学学报(英文版)》2007,23(2):193-200
Using the technique of annihilators, we characterize the w^*-closure of the finite-partition submodule R(N, ~) of a weakly closed nest algebra module U completely; and by virtue of this characterization, we obtain a sufficient and necessary condition for U to have a maximal w^*-closed submodule. 相似文献
17.
§1. IntroductionInthispaper,wewillconcernwithsolvingthesystemsoffuzzylinearequationsAx=bforx,whereAisamatrixoffuzzynumbers;xandbarevectorsoffuzzynumbers.In[2],usingthenewsolutionconcept,sixnewsolutionsaredefined.Thisdiscussionwasrestrictedtosq… 相似文献
18.
汪嘉冈 《数学年刊B辑(英文版)》1983,(1)
If{X(n),n≥1}are random variables which satisfy following linear modelwhere α_j,λ_j,l≤j≤n are unknown constants andis real stationary sequence.In thispaper we discuss the estimation of λ_j,α_j and introduce δ-separated periodgram maximum estimatorλ_j for λ_j.Under some moderate conditions we prove the following consistence and asymptotionormality for these estimators,as the size 相似文献
19.
This paper is concerned with the exponential stability of weak solutions to a linear one-dimensional thermoviscoelastic system with clamped boundary conditions. This system defines a C0-semigroup {S(t)}t≥0 on the space L2(0,1)×C1(0,1)×H1(0, 1), which processes the property of the exponential stability. 相似文献
20.
Sufficient conditions are given for the asymptotic constancy of the solutions of a linear system of difference equations with
delays. Moreover, it is shown that the limits of the solutions, as t→∞, can be computed in terms of the initial function and a special matrix solution of the corresponding adjoint equation. 相似文献