Poincaré recurrence theorem for non-smooth vector fields

Euzébio, Rodrigo D.; Gouveia, Márcio Ricardo Alves

doi:10.1007/s00033-017-0783-y

Cited by 4 publications

(1 citation statement)

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“…On one hand, it is obvious that the existence and uniqueness theorem is not true in the piecewise smooth context [12]. While on the other hand, under suitable assumptions, Poincaré-Bendixson theorem [6], Bendixson-Dulac theorem [8], Peixoto theorem [26] and Poincaré recurrence theorem [10] have been generalized to piecewise smooth differential systems. This paper focuses on the Poincaré index formula and its generalization to piecewise smooth differential systems.…”

Section: The Well Known Poincaré-bendixson Formula Can Be Stated As F...mentioning

confidence: 99%

On the Poincaré–Bendixson Formula for Planar Piecewise Smooth Vector Fields

Li,

Liu,

Llibre

2023

J Nonlinear Sci

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The topological index, or simply the index, of an equilibrium point of a differential system is an integer which saves important information about the local phase portrait of the equilibrium.There are mainly two ways to calculate the index of an isolated equilibrium point of a smooth vector field. First Poincaré and Bendixson proved that the index of an equilibrium point can be obtained from the number of hyperbolic and elliptic sectors that there are in a neighborhood of the equilibrium point, which is known as Poincaré-Bendixson formula for the topological index of an equilibrium point. Second several works contributed to the algebraic method of Cauchy's index for computing the index of an equilibrium point.In this paper we extend the Poincaré-Bendixson formula to planar piecewise smooth vector fields. Applying this formula we define the index of generic codimension-one equilibria for piecewise smooth vector fields, including boundary equilibria, pseudo-equilibria and tangency points.

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