Stable Complete Intersections

Details Stable Complete Intersections Stable Complete Intersections

2011-02-10

arxiv.org/abs/1102.2158v1

Mathematics

Commutative Algebra

1 figure

Scientific paper

A complete intersection of n polynomials in n indeterminates has only a finite number of zeros. In this paper we address the following question: how do the zeros change when the coefficients of the polynomials are perturbed? In the first part we show how to construct semi-algebraic sets in the parameter space over which all the complete intersection ideals share the same number of isolated real zeros. In the second part we show how to modify the complete intersection and get a new one which generates the same ideal but whose real zeros are more stable with respect to perturbations of the coefficients.

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