简介:WeanalyzethreeoneparameterfamiliesofapproximationsandshowthattheyaresympecticinLargrangiansenceandcanberelatedtosymplecticschemesinHamiltoniansensebydifferentsymplecticmapping.WealsogiveadirectgeneralizationofVeselovvariationalprinciplcforconstructionofschemeofhigherorderdifferentialequations.Atlast,wepresentnumericalexperiments.
简介:InthispapertheuniformconvergenceofHermite-FejérinterpolationandGruenwaldtypetheoremofhigherorderonanarbitrarysystemofnodesarepresented.
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简介:1.IntroductionFirstofall,let’srecallthedefinitionsofsymplecticschemes,revertibleschemes,andFeng’swayofconstructionofsymplecticmethodsviageneratingfunctions.Aswell-known,thephaseflow{g’,tER}ofanyHamiltoniansystem(whereJ~I--i:n1,H:RZn--+RIisasmoothfunc...
简介:1.IntroductionTosolvelargesparsesystemsoflinearandnonlinearequationsonthemultiprocessorsystems,manyauthorspresentedandstudiedvariousparalleliterativemethodsinthesenseofmultisplittinginrecentyears.FOrdetailsonecanreferto[1]-[9]andreferencestherein.Amo...
简介:ThispaperpresentsthedualbasesforanewfamilyofgeneralizedBallcurveswithapositionparameterK,whichincludestheBeziercurve,generalizedSaid-Ballcurveandsomeintermediatecurves.Usingthedualbases,therelativeMarsdenidentity,conversionformulasofbasesandcontrolpointsofvariouscurvesareobtained.