Degenerate real hypersurfaces in $\mathbb{C}^2$ with few automorphisms

Details Degenerate real hypersurfaces in $\mathbb{C}^2$ with few automorphisms Degenerate real hypersurfaces in $\mathbb{C}^2$ with few automorphisms

2006-05-19

arxiv.org/abs/math/0605540v1

Mathematics

Complex Variables

Scientific paper

We introduce new biholomorphic invariants for real-analytic hypersurfaces in 2-dimensional complex space and show how they can be used to show that a hypersurface possesses few automorphisms. We give conditions, in terms of the new invariants, guaranteeing that the stability group is finite, and give (sharp) bounds on the cardinality of the stability group in this case. We also give a sufficient condition for the stability group to be trivial. The main technical tool developed in this paper is a complete (formal) normal form for a certain class of hypersurfaces. As a byproduct, a complete classification, up to biholomorphic equivalence, of the finite type hypersurfaces in this class is obtained.

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