简介:本文讨论矩阵方程在子矩阵约束下的Hermitian解的共轭梯度迭代算法,先转化成两个低阶方程,然后利用共轭梯度思想分别构造出低阶方程的共轭梯度迭代算法,运用算法求出矩阵方程的Hermitian解及最佳逼近,最后给出了数值实例来验证算法的有效性.
简介:Theproblemofrelatingtheeigervaluesofann×nHermitianmatrixtothoseofitsRayleigh-Ritzapproximationisconsidered.ThesameresidualboundforunitarilyinvariantnormsonHermilianmatricesisobtainedevenwithouttheorlhonormalandRayleigh-RitzassumptionsinStewartandSun’sbook[9,TheoremIV.4.14].TheresultcanalsobeextendedtonearlyHermitianmatrices.
简介:最后S.Liu[2]和笔者[4]得到了两个Hermite矩阵的Khatri-Rao乘积的一些不等式。我们以两种方式来推广这些结果。首先,将结论推广到任意有限个Hermite矩阵的Khatri-Rao乘积;其次,给出了相应不等式的等式成立的充分必要条件。
简介:在这份报纸,我们在几乎Hermitian上在复杂向量捆上为Hermitian爱因斯坦方程调查Dirichlet问题歧管,并且我们为Hermitian爱因斯坦获得Dirichlet问题的唯一的答案方程。
简介:<正>Foranynaturalnumbersmandn≥17wecanconstructexplicitlyindecomposabledefiniteunimodularnormalHermitianlatticesofranknovertheringofalgebraicintegersRminanimaginaryquadraticfield(-m1/2).Itisprovedthatforanyn(incasem=11,thereisoneexceptionn=3)thereexistindecomposabledefiniteunimodularnormalHermitianR15(R11-latticesofrankn,andweexhibitrepresentativesforeachclass.Intheexceptionalcasetherearenolatticeswiththedesiredproperties.ThemethodgiveninthispapercansolvecompletelytheproblemofconstructingindecomposabledefiniteunimodularnormalHermitianRm-latticesofanyranknforeachm.
简介:ThispapergivesamethodtoconstructindecomposablepositivedefiniteintegralHermitianformsoveranimaginaryqusadraticfieldQ(√-m)withgivendiscriminantandgivenrank.Itisshownthatforanynaturalnumbersnanda,therearen-aryindecompossblepositivedefiniteintegralHermitianlatticesoverQ(√-1)(resp.Q(√-2)withdiscriminanta1exceptforfour(resp.one)exceptions.Intheseexceptionalcasestherearenolatticeswiththedesiredproperties.
简介:Inprinciple,non-HermitianquantumequationsofmotioncanbeformulatedusingasastartingpointeithertheHeisenberg’sortheSchrdinger’spictureofquantumdynamics.Hereitisshowninbothcaseshowtomapthealgebraofcommutators,definingthetimeevolutionintermsofanon-HermitianHamiltonian,ontoanon-HamiltonianalgebrawithaHermitianHamiltonian.Thelogicbehindsuchaderivationisreversible,sothatanyHermitianHamiltoniancanbeusedintheformulationofnon-Hermitiandynamicsthroughasuitablealgebraofgeneralized(non-Hamiltonian)commutators.Theseresultsprovideageneralstructure(atemplate)fornon-Hermitianequationsofmotiontobeusedinthecomputersimulationofopenquantumsystemsdynamics.
简介:摘要 由于矩阵的初等变换和初等矩阵都有“初等”二字,所以非常容易将二者混为一谈.此文的目的在于解释这两个概念的区别,同时也介绍它们的关系.在对矩阵进行运算时,我们可对其进行类似于行列式的行(列)变换或数乘运算等,即矩阵的初等变换.为了搞清楚变换后的矩阵所具有的特性,也为了说明矩阵的初等变换的意义,我们引入初等矩阵的概念.其实初等矩阵就是单位矩阵经矩阵的初等变换后所得的矩阵.具体内容见下文简述.
简介:本文给出了将分块Hermitian-Toeplitz阵与实矩阵互换,并求其特征结构的一种算法,从而减少对计算机内存的要求和提高处理速度.
简介:LetA∈Cm×n,seteigenvaluesofmatrixAwith|λ1(A)|≥|λ2(A)|≥…≥|λn(A)|,writeA≥0ifAisapositivesemidefiniteHermitianmatrix,anddenote∧k(A)=diag(λ1(A),…,λk(A)),∧((n-k).(A)=diag(λk+1(A),…,λn(A))foranyk=1,2,...,nifA≥0.DenoteallnorderunitarymatricesbyUn×n.Problemofequalitiestoholdineigenvalueinequalitiesforproductsofmatriceswas
简介:SupposethatDisadivisionringinwhichthereisdefinedananti-automorphismα→(?)isinvolutorial,RisaleftvectorspaceoverD.Usingthegivenanti-automorphismα→(?),itiseasytoturnRintoarightvectorspaceoverDbysetingx(?)=ax.Bilinearformg(x,y)connectingtheleftvectorspaceRandtherightvectorspaceRisaHermitianscalar.