Two Examples of Toric Arrangements
arXiv:1804.05767 · doi:10.1016/j.jcta.2019.05.006
Abstract
We show that the integral cohomology algebra of the complement of a toric arrangement is not determined by the poset of layers. Moreover, the rational cohomology algebra is not determined by the arithmetic matroid (however it is determined by the poset of layers).
12 pages, 1 figure, removed section 3