Finiteness theorem on Blow-semialgebraic triviality for a family of 3-dimensional algebraic sets

Details Finiteness theorem on Blow-semialgebraic triviality for a family of 3-dimensional algebraic sets Finiteness theorem on Blow-semialgebraic triviality for a family of 3-dimensional algebraic sets

2007-11-19

arxiv.org/abs/0711.2862v1

Mathematics

Algebraic Geometry

38 pages, 1 figure

Scientific paper

In this paper we introduce the notion of Blow-semialgebraic triviality consistent with a compatible filtration for an algebraic family of algebraic sets, as an equisingularity for real algebraic singularities. Given an algebraic family of 3-dimensional algebraic sets defined over a nonsingular algebraic variety, we show that there is a finite subdivision of the parameter algebraic set into connected Nash manifolds over which the family admits a Blow-semialgebraic trivialisation consistent with a compatible filtration. We show a similar result on finiteness also for a Nash family of 3-dimensional Nash sets through the Artin-Mazur theorem. As a corollary of the arguments in their proofs, we have a finiteness theorem on semialgebraic types of polynomial mappings from the 2-dimensional Euclidean space to the p-diemnsional Euclidean space.

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