二次系统中某些图通过鞍型幂零点的有限圈性
Finite cyclicity of some graphics through a nilpotent point of saddle type inside quadratic systems
摘要:
本文证明了二次向量场中的两个图$(I_{12}^1)$和$(I_{13}^1)$通过鞍型三重幂零点的有限圈性。这些结果有助于在1994年推出的程序Dumortier,Eissarie和Rousseau(DRR程序),以显示存在一个统一的上界的数量的极限环的平面二次向量场。
英文摘要:
In this paper we show the finite cyclicity of the two graphics $(I_{12}^1)$ and $(I_{13}^1)$ 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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