简介:由使用一般集中假设与立方的顺序为重复的一个家庭建立一条会聚的定理。使用立方的majorizing功能的劣势;majorizing顺序的集中;主要集中定理的概述。
简介:1.IntroductionFirstofall,let’srecallthedefinitionsofsymplecticschemes,revertibleschemes,andFeng’swayofconstructionofsymplecticmethodsviageneratingfunctions.Aswell-known,thephaseflow{g’,tER}ofanyHamiltoniansystem(whereJ~I--i:n1,H:RZn--+RIisasmoothfunc...
简介:介绍为菲希尔构造了有限差别计划的一个班的研究部分微分方程。逻辑方程的解决方案的性质;高保真度算法的建设;数字方法和preliminaries。
简介:WeanalyzethreeoneparameterfamiliesofapproximationsandshowthattheyaresympecticinLargrangiansenceandcanberelatedtosymplecticschemesinHamiltoniansensebydifferentsymplecticmapping.WealsogiveadirectgeneralizationofVeselovvariationalprinciplcforconstructionofschemeofhigherorderdifferentialequations.Atlast,wepresentnumericalexperiments.
简介:InthispapertheuniformconvergenceofHermite-FejérinterpolationandGruenwaldtypetheoremofhigherorderonanarbitrarysystemofnodesarepresented.
简介:在这篇论文,我们调查Jacobi假光谱为第四个顺序问题的方法。我们在non-uniformlyweightedSobolev空格在Jacobi-Gauss-type插值上建立一些基本结果,它在微分、不可分的方程的数字照,和数字方法的分析用作重要工具。然后,我们为几个单个问题和第四份订单的多重维的问题建议Jacobipseudospectralschemes。Numericalresults示威光谱这些计划的精确性,并且与理论分析与一致很好。
简介:1.IntroductionItiswellknownthattheAdini’selementiscommonlyusedforapproximatingthesolutionofhighorderpartialdifferentialequations(suchasplateproblem).WhatresultscanwegetifwesolvesecondorderimhomogeneousNeumannellipticproblemusingAdini’selement?Weshall...
简介:LetAbearealsquarematrixandVTAV=GbeanupperHessenbergmatrixwithpositivesubdiagonalentries,whereVisanorthogonalmatrix.ThentheimplicitQ-theoremstatesthatoncethefirstcolumnofVisgiventhenVandGareuniquelydetermined.Inthispaper,threeresultsareestablished.First,itholdsareverseorderimplicitQ-theorem:oncethelastcolumnofVisgiven,thenVandGareuniquelydeterminedtoo.Second,itisprovedthatforaKrylovsubspacetwoformulationsoftheArnoldiprocessareequivalentandinonetoonecorrespondence.Finally,bytheequivalencerelationandthereverseorderimplicitQ-theorem,itisprovedthatfortheKrylovsubspace,ifthelastvectorofvectorsequencegeneratedbytheArnoldiprocessisgiven,thenthevectorsequenceandresultingHessenbergmatrixareuniquelydetermined.
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简介:介绍基于ENN计划构造了一个高精确的差别计划的研究。ENN计划和几高顺序精确性的概述中央计划;数字方法使用了;在加权的功能和计划的精确性之间的关系。
简介:Inthispaperweanalyzetheerrorbehaviorofgenerallinearmethodsappliedtosomeclassesofone-parametermultiplystiffsingularlyperturbedproblems.Weobtaintheglobalerrorestimateofalgebraicallyanddiagonallystablegenerallinearmethods.ThemainresultofthispapercanbeviewedasanextensionofthatobtainedbyXiao[13]forthecaseofRunge-Kuttamethods.