Conjecture on almost-everywhere limit sets of differentially positive systems

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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 ξ∈X\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.

References

Primary source

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

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