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  1. Home > Articles & Issues >
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Conference paper

Combinatorial Topology of Toric arrangements

Giacomo d'Antonio (1), Emanuele Delucchi (1)
(1) Fachbereich Mathematik und Informatik [Bremen]
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Imported on
November 21, 2016
Published on
December 31, 2012
Last modified on
March 31, 2025
Volume
DMTCS Proceedings vol. AS, 25th International Conference on Formal Power Series and Algebraic Combinatorics (FPSAC 2013)
Proceedings
DOI
10.46298/dmtcs.2374
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https://about.hal.science/hal-authorisation-v1
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Combinatorial Topology of Toric arrangements

Giacomo d'Antonio (1), Emanuele Delucchi (1)
(1) Fachbereich Mathematik und Informatik [Bremen]
Abstract
English
We prove that the complement of a complexified toric arrangement has the homotopy type of a minimal CW-complex, and thus its homology is torsion-free. To this end, we consider the toric Salvetti complex, a combinatorial model for the arrangement's complement. Using diagrams of acyclic categories we obtain a stratification of this combinatorial model that explicitly associates generators in homology to the "local no-broken-circuit sets'' defined in terms of the incidence relations of the arrangement. Then we apply a suitably generalized form of Discrete Morse Theory to describe a sequence of elementary collapses leading from the full model to a minimal complex.
French
On démontre que l’espace complémentaire d’un arrangement torique complexifié a le type d’homotopie d’un complexe CW minimal, donc que ses groupes d’homologie sont libres. On considère d’abord un modèle combinatoire du complémentaire de l’arrangement: le complexe de Salvetti torique. On obtient une stratification de ce complexe qui fait correspondre explicitement les générateurs d’homologie aux “circuits-non-rompus locaux” associés aux relations d’incidence de l’arrangement. On applique une forme généralisée de la théorie de Morse discrète pour obtenir une suite de collapsements élémentaires qui conduit à un complexe minimal.
Keywords
  • [INFO.INFO-DM]Computer Science [cs]/Discrete Mathematics [cs.DM]
  • Combinatorial topology
  • Toric arrangements
  • Discrete Morse theory
  • Torsion-freeness in homology.
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