Polynomial Bound on the Local Betti Numbers of a Real Analytic Germ
Annales de l'Institut Fourier, Volume 67 (2017) no. 1, pp. 367-396.

This paper proves the existence of a bound on the sum of local Betti numbers of a real analytic germ by a polynomial function of the multiplicity of the germ. This result can be interpreted as a localization of the classical Oleinik–Petrovsky bound (aka. Thom–Milnor bound) on the sum of Betti numbers of a semi-algebraic set. The key elements of the proof are the tangent cone of the germ, the Thom–Mather topological trivialization theorem, the Oleinik–Petrovsky bound, and a result by D. Mumford and J. Heintz bounding the degrees of the generators of an ideal by a polynomial function of the geometric degree of its associated variety. Our result is then applied to yield bounds on known geometric invariants: the Lipschitz–Killing invariants, and the Vitushkin variations.

Cet article borne de manière explicite la somme des nombres de Betti locaux d’un germe analytique réel par un polynôme en la multiplicité du germe. Ce résultat peut être interprété comme une localisation de la borne classique d’Oleinik–Petrovsky (ou borne de Thom–Milnor) de la somme des nombres de Betti d’un ensemble semi-algébrique. Les éléments clefs de la preuve sont le cône tangent du germe, le théorème de trivialité topologique de Thom–Mather, la borne d’Oleinik–Petrovsky, et un résultat de D. Mumford et J. Heintz bornant le degré des générateurs d’un idéal par un polynôme en la multiplicité du degré géométrique de la variété qui lui est associée. Le résultat est ensuite utilisé pour borner des invariants géométriques connus : les invariants de Lipschitz–Killing et les variations de Vitushkin.

Received:
Revised:
Accepted:
Published online:
DOI: 10.5802/aif.3085
Classification: 32B10, 32S30, 32C05, 49Q15, 58K60, 58K65
Keywords: multiplicity, analytic germ, Betti number, Thom–Mather, topological triviality, Thom–Milnor, Lipschitz–Killing, Vitushkin
Mot clés : multiplicité, germe analytique, nombre de Betti, Thom–Mather, trivialité topologique, Thom–Milnor, Lipschitz–Killing, Vitushkin

Alberti, Lionel F. 1

1 McGill University, Montreal, Quebec (Canada)
License: CC-BY-ND 4.0
Copyrights: The authors retain unrestricted copyrights and publishing rights
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Alberti, Lionel F. Polynomial Bound on the Local Betti Numbers of a Real Analytic Germ. Annales de l'Institut Fourier, Volume 67 (2017) no. 1, pp. 367-396. doi : 10.5802/aif.3085. https://aif.centre-mersenne.org/articles/10.5802/aif.3085/

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