Grothendieck ring of semialgebraic formulas and motivic real Milnor fibres

Details Grothendieck ring of semialgebraic formulas and motivic real Milnor fibres Grothendieck ring of semialgebraic formulas and motivic real Milnor fibres

2011-11-14

arxiv.org/abs/1111.3181v3

Mathematics

Algebraic Geometry

29 pages, 1 figure

Scientific paper

We define a Grothendieck ring for basic real semialgebraic formulas, that is for systems of real algebraic equations and inequalities. In this ring the class of a formula takes into consideration the algebraic nature of the set of points satisfying this formula and contains as a ring the usual Grothendieck ring of real algebraic formulas. We give a realization of our ring that allows to express a class as a Z[1/2]- linear combination of classes of real algebraic formulas, so this realization gives rise to a notion of virtual Poincar\'e polynomial for basic semialgebraic formulas. We then define zeta functions with coefficients in our ring, built on semialgebraic formulas in arc spaces. We show that they are rational and relate them to the topology of real Milnor fibres.

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