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Transactions of the Moscow Mathematical Society

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

Authors: Robert Roussarie and Christiane Rousseau
Original publication: Trudy Moskovskogo Matematicheskogo Obshchestva, tom 76 (2015), vypusk 2.
Journal: Trans. Moscow Math. Soc. 2015, 181-218
MSC (2010): Primary 34C07, 37G15
Published electronically: November 17, 2015
MathSciNet review: 3467264
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Abstract: In this paper we introduce new methods to prove the finite cyclicity of some graphics through a triple nilpotent point of saddle or elliptic type surrounding a center. After applying a blow-up of the family, yielding a singular 3-dimensional foliation, this amounts to proving the finite cyclicity of a family of limit periodic sets of the foliation. The boundary limit periodic sets of these families were the most challenging, but the new methods are quite general for treating such graphics. We apply these techniques to prove the finite cyclicity of the graphic $ (I_{14}^1)$, which is part of the program started in 1994 by Dumortier, Roussarie and Rousseau (and called DRR program) to show that there exists a uniform upper bound for the number of limit cycles of a planar quadratic vector field. We also prove the finite cyclicity of the boundary limit periodic sets in all graphics but one through a triple nilpotent point at infinity of saddle, elliptic or degenerate type (with a line of zeros) and surrounding a center, namely the graphics $ (I_{6b}^1)$, $ (H_{13}^3)$, and $ (DI_{2b})$.

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Additional Information

Robert Roussarie
Affiliation: Institut de Mathématiques de Bourgogne, Université de Bourgogne, BP 47870, 21078 Dijon, France

Christiane Rousseau
Affiliation: Département de Mathématiques et Statistique, Université de Montréal, CP 6128 Succ Centre-Ville, Montreal QC H3C 3J7, Canada
Email: rousseac@dms.umontreal.cs

Keywords: Hilbert's 16th problem, finite cyclicity, graphic through a nilpotent point, center graphic, quadratic vector fields
Published electronically: November 17, 2015
Additional Notes: This research was supported by NSERC in Canada.
Article copyright: © Copyright 2015 R. Roussarie, C. Rousseau

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