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Tightening Poincaré–Bendixson theory after counting separately the fixed points on the boundary and interior of a planar region

open access: yesElectronic Journal of Qualitative Theory of Differential Equations
This paper tightens the classical Poincaré–Bendixson theory for a positively invariant, simply-connected compact set $\mathcal M$ in a continuously differentiable planar vector field by further characterizing for any point $p\in \mathcal M$, the ...
Pouria Ramazi   +2 more
doaj   +1 more source

Some remarks on the Melnikov function

open access: yesElectronic Journal of Differential Equations, 2002
We study the Melnikov function associated with a periodic perturbation of a differential equation having a homoclinic orbit. Our main interest is the characterization of perturbations that give rise to vanishing or non-vanishing of the Melnikov function.
Flaviano Battelli, Michal Feckan
doaj  

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