Toric polar maps, normal crossings and mixed volumes

Given a hypersurface in a complex projective space, we prove that the Chern–Schwartz–MacPherson class of a certain open set, namely the complement of the union of the hypersurface and the coordinate hyperplanes, is given (up to sign) by the multidegrees of associated toric polar map, in two particular cases: normal crossings with the coordinate hyperplanes and a nondegeneracy condition with respect to the Newton polytope. In the latter case, we also recover the multidegrees from mixed volumes.

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Publication Details

Journal
Comptes Rendus Mathématique
Published
2025-05-26
DOI
https://doi.org/10.5802/crmath.734
Primary Topic
Advanced Combinatorial Mathematics
Type
article
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article

Toric polar maps, normal crossings and mixed volumes

Nivaldo Medeiros, Thiago Fassarella, Rodrigo Salomão
Comptes Rendus Mathématique
Advanced Combinatorial Mathematics
article

Toric polar maps, normal crossings and mixed volumes

Nivaldo Medeiros, Thiago Fassarella, Rodrigo Salomão
article en

Abstract

Given a hypersurface in a complex projective space, we prove that the Chern–Schwartz–MacPherson class of a certain open set, namely the complement of the union of the hypersurface and the coordinate hyperplanes, is given (up to sign) by the multidegrees of associated toric polar map, in two particular cases: normal crossings with the coordinate hyperplanes and a nondegeneracy condition with respect to the Newton polytope. In the latter case, we also recover the multidegrees from mixed volumes.

Comptes Rendus MathématiqueVol. 363(G5)
Openalex Percentile: Top 83%
Advanced Combinatorial Mathematics
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Toric polar maps, normal crossings and mixed volumes — Nivaldo Medeiros, Thiago Fassarella, et al. · Comptes Rendus Mathématique (2025) | TGRS Research Map | TGRS