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Article Dans Une Revue Calculus of Variations and Partial Differential Equations Année : 2018

On the Whitney extension property for continuously differentiable horizontal curves in sub-Riemannian manifolds

Résumé

In this article we study the validity of the Whitney $C^1$ extension property for horizontal curves in sub-Riemannian manifolds endowed with 1-jets that satisfy a first-order Taylor expansion compatibility condition. We first consider the equiregular case, where we show that the extension property holds true whenever a suitable non-singularity property holds for the input-output maps on the Carnot groups obtained by nilpotent approximation. We then discuss the case of sub-Riemannian manifolds with singular points and we show that all step-2 manifolds satisfy the $C^1$ extension property. We conclude by showing that the $C^1$ extension property implies a Lusin-like approximation theorem for horizontal curves on sub-Riemannian manifolds.
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Dates et versions

hal-01573353 , version 1 (09-08-2017)
hal-01573353 , version 2 (10-01-2018)
hal-01573353 , version 3 (20-12-2018)

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Ludovic Sacchelli, Mario Sigalotti. On the Whitney extension property for continuously differentiable horizontal curves in sub-Riemannian manifolds. Calculus of Variations and Partial Differential Equations, 2018. ⟨hal-01573353v3⟩
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