Nice Partitions of Signed-Graphic Arrangements Are Inductive Factorizations

Weikang Liang; Suijie Wang; Yue Zhou

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arXiv · 2610.38412

Nice Partitions of Signed-Graphic Arrangements Are Inductive Factorizations

Weikang Liang·Suijie Wang·Yue Zhou

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Abstract

Nice partitions of hyperplane arrangements give tensor factorizations of Orlik-Solomon algebras as graded vector spaces. In general, a hyperplane arrangement admitting a nice partition need not be free. In this paper, we consider signed-graphic arrangements, the subarrangements of type-$B$ Weyl arrangements, over fields of characteristic different from $2$. We prove that every nice partition of a signed-graphic arrangement is an inductive factorization and hence that the arrangement is free, with nonzero exponents given by the part sizes. In particular, Terao's conjecture holds for the intersection lattices of signed-graphic arrangements admitting a nice partition.

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Weikang Liang, Suijie Wang, Yue Zhou. 2026-10-28. Nice Partitions of Signed-Graphic Arrangements Are Inductive Factorizations. https://arxiv.org/abs/2610.38412

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