Abstract

L'objet de cet article est l'ecriture d'une nouvelle formulation mixte relative aux problemes elliptiques d'ordre deux, et l'implementation de methodes d'elements finis mixtes pour la determination de solutions approchees. On donne alors des estimations d'erreurs en norme L p et H - s . Enfin, on construit une methode pour laquelle des resultats de superconvergence en norme L p sont obtenus.

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