Comptes Rendus
A comparison result related to Gauss measure
[Un résultat de comparaison relatif à la mesure de Gauss]
Comptes Rendus. Mathématique, Volume 334 (2002) no. 6, pp. 451-456.

In this paper we prove a comparison result for weak solutions to linear elliptic problems of the type

-(aij(x)uxi)xj=f(x)ϕ(x)inΩ,u=0onΩ,
where Ω is an open set of n (n⩾2), ϕ(x)=(2π)n/2exp(−|x|2/2), aij(x) are measurable functions such that aij(x)ξiξjϕ(x)|ξ|2 a.e. xΩ, ξn and f(x) is a measurable function taken in order to guarantee the existence of a solution uH01(ϕ,Ω) of (1.1). We use the notion of rearrangement related to Gauss measure to compare u(x) with the solution of a problem of the same type, whose data are defined in a half-space and depend only on one variable.

Dans cette note on démontre un résultat de comparaison pour les solutions faibles de problèmes elliptiques linéaires du type

-(aij(x)uxi)xj=f(x)ϕ(x)dansΩ,u=0surΩ,
Ω est un ouvert de n (n⩾2), ϕ(x)=(2π)n/2exp(−|x|2/2), aij(x) sont des fonctions mesurables telles que aij(x)ξiξjϕ(x)|ξ|2 p.p. xΩ, ξn et f(x) est une fonction mesurable telle qu'il existe une solution u de (0.1), dans H01(ϕ,Ω). On utilise la notion de rearrangement relatif à la mesure de Gauss pour comparer u(x) avec la solution d'un problème du même type, dont les données sont définies dans un demi plan et dépendent d'une variable seulement.

Reçu le :
Accepté le :
Publié le :
DOI : 10.1016/S1631-073X(02)02295-1

M.Francesca Betta 1 ; Friedman Brock 2 ; Anna Mercaldo 3 ; M.Rosaria Posteraro 3

1 Dipartimento di Matematica, Seconda Università di Napoli, via Vivaldi 43, 81100 Caserta, Italy
2 Department of Mathematics, University of Missouri-Columbia, Columbia, MO 65211, USA
3 Dipartimento di Matematica e Applicazioni “R. Caccioppoli”, Università di Napoli “Federico II”, Via Cintia, 80126 Napoli, Italy
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M.Francesca Betta; Friedman Brock; Anna Mercaldo; M.Rosaria Posteraro. A comparison result related to Gauss measure. Comptes Rendus. Mathématique, Volume 334 (2002) no. 6, pp. 451-456. doi : 10.1016/S1631-073X(02)02295-1. https://comptes-rendus.academie-sciences.fr/mathematique/articles/10.1016/S1631-073X(02)02295-1/

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