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The index of analytic vector fields and Newton polyhedra

Carles Bivià-Ausina (2003)

Fundamenta Mathematicae

We prove that if f:(ℝⁿ,0) → (ℝⁿ,0) is an analytic map germ such that f - 1 ( 0 ) = 0 and f satisfies a certain non-degeneracy condition with respect to a Newton polyhedron Γ₊ ⊆ ℝⁿ, then the index of f only depends on the principal parts of f with respect to the compact faces of Γ₊. In particular, we obtain a known result on the index of semi-weighted-homogeneous map germs. We also discuss non-degenerate vector fields in the sense of Khovanskiĭand special applications of our results to planar analytic vector fields....

The isomorphism problem for toral relatively hyperbolic groups

François Dahmani, Daniel Groves (2008)

Publications Mathématiques de l'IHÉS

We provide a solution to the isomorphism problem for torsion-free relatively hyperbolic groups with abelian parabolics. As special cases we recover solutions to the isomorphism problem for: (i) torsion-free hyperbolic groups (Sela, [60] and unpublished); and (ii) finitely generated fully residually free groups (Bumagin, Kharlampovich and Miasnikov [14]). We also give a solution to the homeomorphism problem for finite volume hyperbolic n -manifolds, for n 3 . In the course of the proof of the main result,...

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