Abstract:In this paper, we study crossing limit cycles of planar discontinuous piecewise differential systems separated by a nonregular switching line, where one subsystem is a linear differential center and the other belongs to one of six families of Hamiltonian nilpotent saddle systems. This work extends previous results for discontinuous piecewise differential systems separated by a straight line to the more general setting of nonregular switching boundaries. The problem is closely related to the second part of Hilbert's 16th problem for discontinuous piecewise differential systems. We prove that the systems under consideration admit at most seven crossing limit cycles. Moreover, for each family of Hamiltonian nilpotent saddle systems, we provide explicit examples exhibiting four crossing limit cycles.
| Subjects: | Dynamical Systems (math.DS) |
| Cite as: | arXiv:2605.24254 [math.DS] |
| (or arXiv:2605.24254v1 [math.DS] for this version) | |
| https://doi.org/10.48550/arXiv.2605.24254 arXiv-issued DOI via DataCite (pending registration) |
From: Pedro Ivan Suarez Navarro [view email]
[v1]
Fri, 22 May 2026 22:07:41 UTC (3,219 KB)
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