Finite cyclicity of some graphics through a nilpotent point of saddle type inside quadratic systems

preprint2015arXivOpen access

Abstract

In this paper we show the finite cyclicity of the two graphics (I121)(I_{12}^1) and (I131)(I_{13}^1) through a triple nilpotent point of saddle type inside quadratic vector fields. These results contribute to the program launched in 1994 by Dumortier, Roussarie and Rousseau (DRR program) to show the existence of a uniform upper bound for the number of limit cycles for planar quadratic vector fields.

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