Infinitesimal adjunction and polar curves

Details Infinitesimal adjunction and polar curves Infinitesimal adjunction and polar curves

2008-10-21

arxiv.org/abs/0810.3884v1

Mathematics

Dynamical Systems

32 pages, 4 figures

Scientific paper

The polar curves of foliations $\mathcal F$ having a curve $C$ of separatrices generalize the classical polar curves associated to hamiltonian foliations of $C$. As in the classical theory, the equisingularity type ${\wp}({\mathcal F})$ of a generic polar curve depends on the analytical type of ${\mathcal F}$, and hence of $C$. In this paper we find the equisingularity types $\epsilon (C)$ of $C$, that we call kind singularities, such that ${\wp}({\mathcal F})$ is completely determined by $\epsilon (C)$ for Zariski-general foliations $\mathcal F$. Our proofs are mainly based on the adjunction properties of the polar curves. The foliation-like framework is necessary, otherwise we do not get the right concept of general foliation in Zariski sense and, as we show by examples, the hamiltonian case can be out of the set of general foliations.

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