
doi: 10.46298/dmtcs.2374
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.
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
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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