Invariance of Milnor numbers and topology of complex polynomials

Details Invariance of Milnor numbers and topology of complex polynomials Invariance of Milnor numbers and topology of complex polynomials

2002-01-15

arxiv.org/abs/math/0201126v1

Commentarii Mathematici Helvetici (2003, vol. 78, 134-152)

Mathematics

Algebraic Geometry

16 pages

Scientific paper

We give a global version of Le-Ramanujam mu-constant theorem for polynomials. Let f_t, (t in [0,1]), be a family of polynomials of n complex variables with isolated singularities, whose coefficients are polynomials in t. We consider the case where some numerical invariants are constant (the affine Milnor number, the Milnor number at infinity, the number of critical values, the number of affine critical values, the number of critical values at infinity). Let n=2, we also suppose the degree of the f_t is a constant, then the polynomials f_0 and f_1 are topologically equivalent. For n>3 we suppose that critical values at infinity depend continuously on t, then we prove that the geometric monodromy representations of the f_t, are all equivalent.

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