Conjecture on almost-everywhere limit sets of differentially positive systems

Let Σ\Sigma be a continuous dynamical system on a vector space X\mathcal{X} of the form

x˙=f(x),\dot{x}=f(x),

and let KX\mathcal{K}_{\mathcal{X}} be the cone field used in Theorem

. Assume the hypotheses of that theorem, and write $\omega(\xi)$ for the $\omega$-limit set of the trajectory starting at $\xi$. **Limit-set conjecture.** Under the assumptions of Theorem

, for almost every ξX\xi\in\mathcal{X}, the ω\omega-limit set ω(ξ)\omega(\xi) is given by either a fixed point, a limit cycle, or fixed points and connecting arcs.

This conjecture proposes that, despite the potentially complex limit sets of general differentially positive systems, almost every trajectory has an ω\omega-limit set with one of these simple forms. The supplied context does not state whether the conjecture has been proved or disproved.

Sources & referencesView supporting material

Primary source

Fulvio Forni and Rodolphe Sepulchre, “Differentially positive systems”, arXiv:1405.6298 (2014).

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