Título original | Propriétés de moyenne pour les solutions de systèmes elliptiques |
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Título inglés | Mean properties for the solutions of elliptic systems. |
Título español | Propiedades de media para las soluciones de sistemas elípticos |
Autor/es | Détraz, Jacqueline |
Organización | U.F.R. Univ. Provence, Marsella, Francia |
Revista | 0214-1493 |
Publicación | 1993, 37 (1): 83-89, 7 Ref. |
Tipo de documento | articulo |
Idioma | Francés |
Resumen inglés | In this article, we consider the set F of functions annihilated by a uniformly elliptic system S in an open set Ω of Rn. We show that, as in the case of harmonic functions, F satisfies a submean-property, first for p=2 by elliptic estimates, then for all p > 0: |Ñk u(x)|p ≤ C / (rn+kp) ∫B(x,r) |u(y)|p dy for each u in F, each k > 0 and every ball B(x,r) included in Ω. As a consequence, we can compare ||u||Lp(Ω) and ||Ñku||Lp(Ω,δkp) where δ is the distance to the boundary of Ω, under the hypothesis that S has constant coefficients or satisfies S(1) = 0. We conclude that, with the metric ||u||Lp(Ω) + ||Ñu||Lp(Ω) we have a compacity property of the ball of F for all p > 0. |
Clasificación UNESCO | 120220 |
Palabras clave español | Ecuaciones diferenciales elípticas ; Función armónica |
Código MathReviews | MR1240924 |
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