The degree bound for generators involving the second variable in Jacobian generic initial ideals

Let A\mathcal{A} be a central arrangement in Kn+1\mathbb{K}^{n+1}. Write rgin(J(A))\operatorname{rgin}(J(\mathcal{A})) for the generic initial ideal of its Jacobian ideal, and set

p0=min{px1prgin(J(A))}.p_0=\min\{p\mid x_1^p\in\operatorname{rgin}(J(\mathcal{A}))\}.

A minimal generator involving x2x_2 is a minimal monomial generator tt of rgin(J(A))\operatorname{rgin}(J(\mathcal{A})) that contains x2x_2 as a factor. The degree bound conjecture. If rgin(J(A))\operatorname{rgin}(J(\mathcal{A})) has a minimal generator tt involving x2x_2, then

deg(t)p0.\deg(t)\geq p_0.

This conjecture concerns the structure of generic initial ideals of Jacobian ideals of central arrangements and would constrain the degrees of generators involving variables beyond x1x_1. The supplied source does not state that it has been proved or disproved, so its status remains open.

Sources & referencesView supporting material

Primary source

Simone Marchesi, Elisa Palezzato and Michele Torielli, “Lefschetz properties and the Jacobian algebra of 3-dimensional hyperplane arrangements”, arXiv:2310.17794 (2023).

Additional references

3 papers in this index state this conjecture (2019–2023). The statement above is taken from the most recent of them; the others are arXiv:2003.06294, arXiv:1911.04083.

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