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arXiv · 2609.39761

Complete solution to the weak persistent center and isochronous center problems of cubic polynomial systems

Feng Li·Huimei Liu·Chen Cao·Pei Yu
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Abstract

In this paper, we investigate weakly persistent centers for several classes of planar cubic differential systems, including systems with a nondegenerate linear center and systems with a nilpotent center. Necessary parameter relations are obtained by computing singular point quantities or quasi-Lyapunov constants, while their sufficiency is established by suitable analytic constructions. For the general complex cubic system, we obtain necessary and sufficient conditions for the origin to be a weakly persistent center, and the corresponding result for the associated general real cubic system follows by imposing the conjugacy relations between the complex coefficients. We further characterize the weakly persistent isochronous centers of the general complex cubic system by combining the weakly persistent center conditions with the vanishing of the linearization quantities and constructing time-preserving analytic linearizations.

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Feng Li, Huimei Liu, Chen Cao, Pei Yu. 2026-10-05. Complete solution to the weak persistent center and isochronous center problems of cubic polynomial systems. https://arxiv.org/abs/2609.39761

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