Motivic invariants of Arc-Symmetric sets and Blow-Nash Equivalence

Details Motivic invariants of Arc-Symmetric sets and Blow-Nash Equivalence Motivic invariants of Arc-Symmetric sets and Blow-Nash Equivalence

2003-04-15

arxiv.org/abs/math/0304195v1

Mathematics

Algebraic Geometry

26 pages, 4 figures

Scientific paper

We define invariants of the blow-Nash equivalence of real analytic function germs, in a similar way that the motivic zeta functions of Denef & Loeser. As a key ingredient, we extend the virtual Betti numbers, which were known for real algebraic sets, as a generalized Euler characteristics for projective constructible arc-symmetrics sets. Actually we prove more: the virtual Betti numbers are not only algebraic invariant, but also Nash-invariant of arc-symmetric sets. Our zeta functions enable to sketch the blow-Nash equivalence classes of Brieskorn polynomials of two variables.

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