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arXiv · 2605.24254

Crossing limit cycles of discontinuous piecewise differential systems with nilpotent saddles separated by a nonregular line

Sonia Isabel Renteria Alva·Pedro Iván Suárez Navarro
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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.

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Sonia Isabel Renteria Alva, Pedro Iván Suárez Navarro. 2026-05-22. Crossing limit cycles of discontinuous piecewise differential systems with nilpotent saddles separated by a nonregular line. https://arxiv.org/abs/2605.24254

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