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Discrete Mathematics & Theoretical Computer Science
Article . 2013 . Peer-reviewed
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Combinatorial Topology of Toric arrangements

Authors: Giacomo d'Antonio; Emanuele Delucchi;

Combinatorial Topology of Toric arrangements

Abstract

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. 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

combinatorial topology, [info.info-dm] computer science [cs]/discrete mathematics [cs.dm], Combinatorial topology, toric arrangements, Torsion-freeness in homology., [INFO.INFO-DM]Computer Science [cs]/Discrete Mathematics [cs.DM], Toric arrangements, discrete morse theory, torsion-freeness in homology., QA1-939, Mathematics, Discrete Morse theory

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
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Published in a Diamond OA journal