Generalized Terao conjecture for d-arrangements

Let C1,C2PC2\mathcal{C}_{1},\mathcal{C}_{2} \subset \mathbb{P}^{2}_{\mathbb{C}} be two dd-arrangements for a fixed d1d\geqslant 1. Let G1G_{1} and G2G_{2} be their associated Levi graphs. Generalized Terao conjecture. If G1G_{1} and G2G_{2} are isomorphic and C1\mathcal{C}_{1} is free, then C2\mathcal{C}_{2} is also free.

This asks whether freeness of a dd-arrangement is determined by the isomorphism class of its Levi graph, extending Terao's conjecture from line arrangements to arrangements of curves. The source presents it as a question, and no resolution is supplied here.

Sources & referencesView supporting material

Primary source

Piotr Pokora and Tim Römer, “Algebraic properties of Levi graphs associated with curve arrangements”, arXiv:2201.11788 (2022).

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