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A basis for the cohomology of compact models of toric arrangements

In this paper we find monomial bases for the integer cohomology rings of compact wonderful models of toric arrangements. In the description of the monomials various combinatorial objects come into play: building sets, nested sets, and the fan of a suitable toric variety. We provide some examples computed via a SageMath program and then we focus on the case of the toric arrangements associated with root systems of type A. Here the combinatorial description of our basis offers a geometrical point of view on the relation between some Eulerian statistics on the symmetric group.

preprint2023arXivOpen access
Giovanni GaiffiOscar PapiniViola Siconolfi
math.ATmath.CO
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Giovanni GaiffiOscar PapiniViola Siconolfi

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