简介:1.IntroductionThepurposeofthispaperistostudytheleastsquaresproblemofthematrixequationF~PGwithrespecttoPcSa,i.e.(PI)R\qIIF--PGll,whereF,GERnxmandG/0.Where11’11denotestheFrobeniusnorm,andSa~{XeS'fX20},S'={XER'''IX=X'}.Problem(PI)wasfirstformulatedbyAll...
简介:<正>LetE(X)=[{N≤X;N≠p12+p23+p34+p45foranyprimespi}|.Itisprovedinthispaperthatthereexistsapositiveconstantδ>0suchthatE(X)《δX1-δwhichimprovesaresultofprachar.
简介:Inapplicationsoflearningfromexamplestoreal-worldtasks,featuresubsetselectionisimportanttospeeduptrainingandtoimprovegeneralizationperformance.Ideally,aninductivealgorithmshouldusesubsetoffeaturesassmallaspossible.Inthispaperhowever,theauthorsshowthattheproblemofselectingtheminimumsubsetoffeaturesisNP-hard.Thepaperthenpresentsagreedyalgorithmforreaturesubsetselection.Theresultofrunningthegreedyalgorithmonhand-writtennumeralrecognitionproblemisalsogiven.
简介:THEDISTURBANCELOCALIZATIONPROBLEMFORSINGULARSYSTEMSTanLiansheng(WuhanInst.ofMath.Sci.,Chin.Acad.ofSci.,Wuhan430071,China.)Abs...
简介:ByusingMoore-Penrosegeneralizedinverseandthegeneralsingularvaluedecompositionofmatrices,thispaperestablishesthenecessaryandsufficientconditionsfortheexistenceofandtheexpressionsforthecentrosymmetricsolutionswithasubmatrixconstraintofmatrixinverseproblemAX=B.Inaddition,inthesolutionsetofcorrespondingproblem,theexpressionoftheoptimalapproximationsolutiontoagivenmatrixisderived.
简介:Inthispaper,thedualmixedmethodforanunilateralproblem,whichisthesimplifiedmodellingofscalarfunctionforthefriction-freecontactproblem,isconsidered.Thedualmixedproblemisintroduced,theexistenceanduniqenessofthesolutionoftheproblemarepresented,anderrorboundsO(h^3/4)andO(h^3/2)areobtainedforthedualmixedfiniteelementapproximationsofRaviart-Thomaselementsfork=0andk=1respectively.
简介:isgainedbydeletingthekthrowandthekthcolumn(k=1,2,...,n)fromTn.Weputfor-wardaninverseeigenvalueproblemtobethat:Ifwedon’tknowthematrixT1,n,butweknowalleigenvaluesofmatrixT1,k-1,alleigenvaluesofmatrixTk+1,k,andalleigenvaluesofmatrixT1,ncouldweconstructthematrixT1,n.Letμ1,μ2,…,μk-1,μk,μk+1,…,μn-1,
简介:Theunitcircleproblemistheproblemoffindingthenumberofeigenvaluesofanon-Hermitianmatrixinsideandoutsidetheunitcircle.Toreducethecostofcomputingeigenvaluesfortheproblem,adirectmethod,whichisanalogoustothatgivenin[5],isproposedinthispaper.
简介:Inthispaper,strongconvergenceofaniterativesequenceisproved,whichcomputesanapproximatesolutionofthesetofsolutionsofsplitvariationalinclusionproblem,thesetoffixedpointsofanonexpansivemappingandthesetofcommonfixedpointsofafamilyofgeneralizedasymptoticallynonexpansivesemigroup.Resultsobtainedinthispaperextendandunifythepreviouslyknownresultsinthepreviousliteratures.