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Unfolding of a Quadratic Integrable System with Two Centers and Two Unbounded Heteroclinic Loops

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Abstract:

In this paper we present a complete study of quadratic 3-parameter unfoldings of some integrable system belonging to the class Q R 3 , and having two centers and two unbounded heteroclinic loops. We restrict to unfoldings that are transverse to Q R 3 , obtain a versal bifurcation diagram and all global phase portraits, including the precise number and configuration of the limit cycles. It is proved that 3 is the maximal number of limit cycles surrounding a single focus, and only the (1, 1)-configuration can occur in case of simultaneous nests of limit cycles. Essentially the proof relies on a careful analysis of a related non-conservative Abelian integral.

Document Type: Research Article

Affiliations: 1: Limburgs Universitair Centrum, Universitaire Campus, Diepenbeek, B-3590, Belgium 2: Department of Mathematics and Institute of Mathematics, Peking University, Beijing, People's Republic of China

Publication date: September 1, 1997

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