The depth of the Jacobian ring of a homogeneous polynomial in three variables

Simis, Aron

doi:10.1090/S0002-9939-05-08169-4

The depth of the Jacobian ring of a homogeneous polynomial in three variables
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Proc. Amer. Math. Soc. 134 (2006), 1591-1598 Request permission

Abstract:

The question as to whether the Jacobian ideal of an irreducible projective plane curve always admits an irrelevant component has been going around for some years. One shows that a curve will satisfy this if it has only ordinary nodes or cusps, while an example is given of a family of sextic curves whose respective Jacobian ideals are saturated. The connection between this problem and the theory of homogeneous free divisors in three variables is also pointed out, so the example gives a family of Koszul-free divisors.

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