Freeness of divisors with equidimensional radical Jacobian ideal of depth two

Let DSD \subseteq S be a divisor in a complex manifold SS, defined at a point pp by hOS,ph \in \mathcal{O}_{S,p}. Assume that its Jacobian ideal JhJ_h is radical, equidimensional, and has depth 22 in OS,p\mathcal{O}_{S,p}. Depth-two freeness conjecture. The quotient OS,p/Jh\mathcal{O}_{S,p}/J_h is Cohen--Macaulay; equivalently, such a divisor is free at pp. This is posed as the expected behavior for radical Jacobian ideals of depth two; the surrounding discussion records special cases and examples but does not resolve the general assertion.

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Primary source

Eleonore Faber, “Characterizing normal crossing hypersurfaces”, arXiv:1201.6276 (2014).

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