Differential Geometry
New compatibility conditions for the fundamental theorem of surface theory
[De nouvelles conditions de compatibilité pour le théorème fondamental de la théorie des surfaces]
Comptes Rendus. Mathématique, Tome 345 (2007) no. 5, pp. 273-278.

Le théorème fondamental de la théorie des surfaces affirme classiquement que, si un champ de matrices (aαβ) symétriques définies positives d'ordre deux et un champ de matrices (bαβ) symétriques d'ordre deux satisfont ensemble les équations de Gauss et Codazzi–Mainardi dans un ouvert ωR2 connexe et simplement connexe, alors il existe une immersion θ:ωR3 telle que ces deux champs soient les première et deuxième formes fondamentales de la surface θ(ω), et cette surface est unique aux isométries propres de R3 près.

Dans cette Note, nous identifions de nouvelles conditions de compatibilité, exprimées à nouveau à l'aide des fonctions aαβ et bαβ, qui conduisent aussi à un théorème analogue d'existence et d'unicité. Ces conditions sont de la forme

1A22A1+A1A2A2A1=0 dans ω,
A1 et A2 sont des champs de matrices antisymétriques d'ordre trois, qui sont des fonctions des champs (aαβ) et (bαβ), le champ (aαβ) apparaissant en particulier par l'intermédiaire de sa racine carrée. L'immersion inconnue θ:ωR3 est trouvée dans cette approche dans des espaces fonctionnelles « de faible régularité », à savoir Wloc2,p(ω;R3), p>2.

The fundamental theorem of surface theory classically asserts that, if a field of positive-definite symmetric matrices (aαβ) of order two and a field of symmetric matrices (bαβ) of order two together satisfy the Gauss and Codazzi–Mainardi equations in a connected and simply-connected open subset ω of R2, then there exists an immersion θ:ωR3 such that these fields are the first and second fundamental forms of the surface θ(ω) and this surface is unique up to proper isometries in R3.

In this Note, we identify new compatibility conditions, expressed again in terms of the functions aαβ and bαβ, that likewise lead to a similar existence and uniqueness theorem. These conditions take the form

1A22A1+A1A2A2A1=0in ω,
where A1 and A2 are antisymmetric matrix fields of order three that are functions of the fields (aαβ) and (bαβ), the field (aαβ) appearing in particular through its square root. The unknown immersion θ:ωR3 is found in the present approach in function spaces ‘with little regularity’, viz., Wloc2,p(ω;R3), p>2.

Accepté le :
Publié le :
DOI : 10.1016/j.crma.2007.07.014
Ciarlet, Philippe G. 1 ; Gratie, Liliana 2 ; Mardare, Cristinel 3

1 Department of Mathematics, City University of Hong Kong, 83, Tat Chee Avenue, Kowloon, Hong Kong
2 Liu Bie Ju Centre for Mathematical Sciences, City University of Hong Kong, 83, Tat Chee Avenue, Kowloon, Hong Kong
3 Laboratoire Jacques-Louis Lions, Université Pierre-et-Marie-Curie, 4, place Jussieu, 75005 Paris, France
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Ciarlet, Philippe G.; Gratie, Liliana; Mardare, Cristinel. New compatibility conditions for the fundamental theorem of surface theory. Comptes Rendus. Mathématique, Tome 345 (2007) no. 5, pp. 273-278. doi : 10.1016/j.crma.2007.07.014. http://www.numdam.org/articles/10.1016/j.crma.2007.07.014/

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