Upper-bound for the number of robust parabolic curves for a class of maps tangent to identity

Details Upper-bound for the number of robust parabolic curves for a class of maps tangent to identity Upper-bound for the number of robust parabolic curves for a class of maps tangent to identity

2007-02-20

arxiv.org/abs/math/0702576v1

Mathematics

Complex Variables

Scientific paper

The Leau-Fatou flower theorem completely describes the dynamic behavior of $1-$dimensional maps tangent to the identity. In dimension two Hakim and Abate proved that if $f$ is a holomorphic map tangent to the identity in $\mathbb{C}^2$ and $\nu(f)$ is the degree of the first non vanishing jet of $f-Id$ then there exist $\nu(f)-1$ robust parabolic curves (RP curves for short), namely attractive petals at the origin which survive under by blow-up. The set of the exponential of holomorphic vector fields (of order greater than or equal to two), $\Phi_{\geq 2}(\mathbb{C}^2,0)$, is dense in the space of germs of maps tangent to the identity. In this paper we give an upper-bound for the number of robust parabolic curves of $f\in \Phi_{\geq 2}(\mathbb{C}^2,0) .$

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