Titre : Limit sets and global dynamic for 2-D divergence-free vector fields
Auteurs : Habib Marzougui,
Revue : Advances in Pure and Applied Mathematics
Numéro : Issue 3 (June 2022)
Volume : 13
Date : 2022/06/1
DOI : 10.21494/ISTE.OP.2022.0837
ISSN : 1869-6090
Résumé : The global structure of divergence-free vector fields on closed surfaces is investigated. We prove that if M is a closed surface and $$${V}$$$ is a divergence-free $$$C^{1}$$$-vector field with finitely many singularities on M then every orbit L of $$$\mathcal{V}$$$ is one of the following types: (i) a singular point, (ii) a periodic orbit, (iii) a closed (non periodic) orbit in M* = M - Sing($$$\mathcal{V}$$$), (iv) a locally dense orbit, where Sing($$$\mathcal{V}$$$) denotes the set of singular points of $$$\mathcal{V}$$$. On the other hand, we show that the complementary in M of periodic components and minimal components is a compact invariant subset consisting of singularities and closed (non compact) orbits in M*. These results extend those of T. Ma and S. Wang in [Discrete Contin. Dynam. Systems, 7 (2001), 431-445] established when the divergence-free vector field $$$\mathcal{V}$$$ is regular that is all its singular points are non-degenerate.
Éditeur : ISTE OpenScience