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Sur l’équation de Monge-Ampère complexe dans la boule de n

Alain Dufresnoy — 1989

Annales de l'institut Fourier

On considère le problème de Dirichlet : ( d d c u ) n = 0 dans B et u | B = ϕ B désigne la boule unité de n . Nous donnons une démonstration simple du fait que si ϕ C 1 , 1 ( B ) , alors u C 1 , 1 ( B ) ; de plus la croissance du coefficient de Lipschitz de la différentielle de u est contrôlée par l’inverse de la distance au bord.

Sur les changements de signe d'une fonction harmonique dans le demi-plan

Lucien ChevalierAlain Dufresnoy — 2001

Studia Mathematica

In our recent paper [2], the study of the kernel associated with a singular integral led us to another question, relating to the boundary behaviour of the sign of a harmonic function in a half-plane. In this paper, the possible existence of sign oscillations of the Poisson integral P(f) in the half-plane along rays is related to regularity properties of the boundary function f. This allows us to obtain a result of Fatou type for the sign of P(f), under a regularity assumption that we prove to be...

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