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Dans ce travail on étudie le comportement, par -perturbations, de la classe d’une forme de Pfaff. Les principaux résultats sont :
1) L’ensemble des formes de Pfaff sur une variété compacte qui peuvent s’écrire globalement sous la forme est -dense, dans l’ensemble des formes de Pfaff sur .
2) Si est une forme de contact sur une variété de dimension 3, toute forme de contact suffisamment voisine de au sens de la -topologie définit la même orientation que celle de...
In this paper we give certain Riemannian metrics on the manifolds Sn-1 x S1 and Sn (n ≥ 2), which have the property to determine these manifolds, up to diffeomorphisms.
The global expressions used for Riemannian metrics are based on the global expression for exterior forms studied in [4]. In [3] one finds certain metrics using global expressions that differ from the type we propose.
To some extent, Theorem 3 is a...
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