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Singularités éliminables pour des équations semi-linéaires

Pierre Baras;  Michel Pierre — 1984

Annales de l'institut Fourier

Étant donné L un opérateur différentiel d’ordre m sur un ouvert Ω de R N , K un compact de Ω , γ > 1 et γ ' = γ / ( γ - 1 ) , nous montrons que toute solution de “ L u + u γ = 0 sur Ω ∖ K , u ≥ 0 ” est solution de “ L u + u γ = 0 sur Ω ” dès que la W m , γ ' -capacité de K est nulle. Cette condition s’avère nécessaire quand L est un opérateur elliptique d’ordre 2. Dans ce cas, nous montrons aussi que ` ` L u + u | u | γ - 1 = μ , u | ∂ Ω = 0 ' ' où μ est une mesure de Radon bornée sur Ω , a une solution si et seulement si μ ne charge pas les ensembles de W 2 , γ ' -capacité nulle.

Capacitary strong type estimates in semilinear problems

D. Adams;  Michel Pierre — 1991

Annales de l'institut Fourier

We prove the equivalence of various capacitary strong type estimates. Some of them appear in the characterization of the measures μ that are admissible data for the existence of solutions to semilinear elliptic problems with power growth. Other estimates are known to characterize the measures μ for which the Sobolev space W 2 , p can be imbedded into L p ( μ ) . The motivation comes from the semilinear problems: simpler descriptions of admissible data are given. The proof surprisingly involves the theory of singular...

About stability of equilibrium shapes

Marc Dambrine;  Michel Pierre — 2010

ESAIM: Mathematical Modelling and Numerical Analysis

We discuss the stability of "critical" or "equilibrium" shapes of a shape-dependent energy functional. We analyze a problem arising when looking at the positivity of the second derivative in order to prove that a critical shape is an optimal shape. Indeed, often when positivity -or coercivity- holds, it does for a weaker norm than the norm for which the functional is twice differentiable and local optimality cannot be deduced. We solve this problem for a particular but significant example. We...

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