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Régularité des solutions d'équations aux dérivées partielles non linéaires associées à un système de champs de vecteurs
We study non-linear partial differential equations of form F(x,X α u)=0, |α|≤m, where X 1 ,...,X p are vectors fields satisfying Hörmander’s condition. Let u be of class C 2m+1 ; we suppose that the localisation of the linearized operator on the Lie group associated to the system of the …