Approximating $ {W}^{2,2}$ isometric immersions

Hornung, Peter

doi:10.1016/j.crma.2008.01.001

Differential Geometry

Approximating

W^{2, 2}

isometric immersions
[Approximation de

W^{2, 2}

par des immersions isométriques]

Présenté par : John M. Ball

Hornung, Peter ¹

¹ Fachbereich Mathematik, Universität Duisburg-Essen, 47048 Duisburg, Germany

Comptes Rendus. Mathématique, Tome 346 (2008) no. 3-4, pp. 189-192.

Résumé
Abstract

Soient $S \subset R^{2}$ un domaine lipschitzien borné et $W_{iso}^{2, 2} (S; R^{3})$ l'ensemble $W_{iso}^{2, 2} (S; R^{3}) = {u \in W^{2, 2} (S; R^{3}) : {(\nabla u)}^{T} (\nabla u) = Id p.p.}$ . Sous une hypothèse supplémentaire de régularité sur la frontière ∂S (qui est satisfaite dans le cas où ∂S est continument différentiable par morceaux), nous prouvons que l'adhérence $W^{2, 2}$ de $W_{iso}^{2, 2} (S; R^{3}) \cap C^{\infty} (\bar{S}; R^{3})$ est $W_{iso}^{2, 2} (S; R^{3})$ .

Let $S \subset R^{2}$ be a bounded Lipschitz domain and set $W_{iso}^{2, 2} (S; R^{3}) = {u \in W^{2, 2} (S; R^{3}) : {(\nabla u)}^{T} (\nabla u) = Id a.e.}$ . Under an additional regularity condition on the boundary ∂S (which is satisfied if it is piecewise continuously differentiable) we prove that the $W^{2, 2}$ closure of $W_{iso}^{2, 2} (S; R^{3}) \cap C^{\infty} (\bar{S}; R^{3})$ agrees with $W_{iso}^{2, 2} (S; R^{3})$ .

Reçu le : 2007-04-13
Accepté le : 2008-01-07
Publié le : 2008-01-28

DOI : 10.1016/j.crma.2008.01.001

Affiliations des auteurs :

Hornung, Peter ¹

¹ Fachbereich Mathematik, Universität Duisburg-Essen, 47048 Duisburg, Germany

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Hornung, Peter. Approximating $ {W}^{2,2}$ isometric immersions. Comptes Rendus. Mathématique, Tome 346 (2008) no. 3-4, pp. 189-192. doi : 10.1016/j.crma.2008.01.001. http://www.numdam.org/articles/10.1016/j.crma.2008.01.001/

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