Modified Orlik's conjecture for characteristic-polynomial divisibility
Modified Orlik's conjecture for characteristic-polynomial divisibility
Let be an -arrangement and let . Write , and let denote the Poincaré polynomial. Assume that is free and that
Equivalently, assume that divides . Modified Orlik's conjecture. There exists an arrangement and such that, for the triple , (1) with ; (2) divides both and ; and (3) neither nor is free, or is free and is not free.
The source introduces this as a conjectural counterexample to the stronger modified Orlik problem. The stated belief is that the problem is too strong and that such an arrangement exists; no resolution is supplied in the provided text.
Sources & referencesView supporting material
Primary source
Takuro Abe, “Restrictions of free arrangements and the division theorem”, arXiv:1603.03863 (2016).
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