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Multiplicateurs de Mikhlin pour une classe particulière de groupes non-unimodulaires

Sami Mustapha — 1998

Annales de l'institut Fourier

On montre, pour une classe particulière de groupes non-unimodulaires G = N , où N est un groupe de Lie stratifié et où l’action de est définie par les dilatations naturelles de N , et pour les sous-laplaciens invariants à gauche correspondants Δ , que toute fonction m H 2 + ϵ ( ) possédant un support compact dans + définit un opérateur m ( Δ ) borné sur les espaces de Lebesgue L p ( G , d r g ) associés à la mesure de Haar invariante à droite sur G , 1 p .

Construction of Sobolev spaces of fractional order with sub-riemannian vector fields

Sami MustaphaFrançois Vigneron — 2007

Annales de l’institut Fourier

Given a smooth family of vector fields satisfying Chow-Hörmander’s condition of step 2 and a regularity assumption, we prove that the Sobolev spaces of fractional order constructed by the standard functional analysis can actually be “computed” with a simple formula involving the sub-riemannian distance. Our approach relies on a microlocal analysis of translation operators in an anisotropic context. It also involves classical estimates of the heat-kernel associated to the sub-elliptic...

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