Mathematics > Home > Advances in Pure and Applied Mathematics > Issue 3 (June 2022) > Article
Habib Marzougui
University of Carthage
Tunisie
Published on 1 June 2022 DOI : 10.21494/ISTE.OP.2022.0837
The global structure of divergence-free vector fields on closed surfaces is investigated. We prove that if M is a closed surface and is a divergence-free -vector field with finitely many singularities on M then every orbit L of is one of the following types: (i) a singular point, (ii) a periodic orbit, (iii) a closed (non periodic) orbit in M* = M - Sing(), (iv) a locally dense orbit, where Sing() denotes the set of singular points of . 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 is regular that is all its singular points are non-degenerate.
The global structure of divergence-free vector fields on closed surfaces is investigated. We prove that if M is a closed surface and is a divergence-free -vector field with finitely many singularities on M then every orbit L of is one of the following types : (i) a singular point, (ii) a periodic orbit, (iii) a closed (non periodic) orbit in M* = M - Sing(), (iv) a locally dense orbit, where Sing() denotes the set of singular points of . 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 is regular that is all its singular points are non-degenerate.
divergence free-vector -elds quasiminimal set !-limit set non- trivial recurrent orbit Poincar-e-Bendixson Theorem minimal component closed surface
divergence free-vector -elds quasiminimal set !-limit set non- trivial recurrent orbit Poincar-e-Bendixson Theorem minimal component closed surface