The Cyclicity of Period Annulus of Degenerate Quadratic Hamiltonian System with Elliptic Segment

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Li, Chengzhi
Yi, Yingfei
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http://hdl.handle.net/1853/29492
Abstract
We study the cyclicity of period annuli (or annulus) for general degenerate quadratic Hamiltonian systems with an elliptic segment or a saddle loop, under quadratic perturbations. By using geometrical arguments and studying the respective Abelian integral based on the Picard-Fuchs equation, it is shown that the cyclicity of period annuli or annulus for such systems equals two. This result, together with those of [8],[10],[11],[18],[19], gives a complete solution to the infinitesimal Hilbert 16th problem in the case of degenerate quadratic Hamiltonian systems under quadratic perturbations.
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2000
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