简介：Inthispaper,thedualmixedmethodforanunilateralproblem,whichisthesimplifiedmodellingofscalarfunctionforthefriction-freecontactproblem,isconsidered.Thedualmixedproblemisintroduced,theexistenceanduniqenessofthesolutionoftheproblemarepresented,anderrorboundsO(h^3/4)andO(h^3/2)areobtainedforthedualmixedfiniteelementapproximationsofRaviart-Thomaselementsfork=0andk=1respectively.
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