The core formula for ideals generated by general forms

Let R=k[x1,,xn](x1,,xn)R=k[x_1,\ldots,x_n]_{(x_1,\ldots,x_n)} with kk a field of characteristic zero, and let m\mathfrak{m} denote the maximal ideal of RR. Let I=Id+md+1I=I_d+\mathfrak{m}^{d+1}, where IdI_d is a complete intersection ideal of ss general dd-forms with 1s<n1\leq s<n. Define

b=dns+1d+1,b=\left\lfloor\frac{dn-s+1}{d+1}\right\rfloor,

and

a=dns+1(d+1)b.a=dn-s+1-(d+1)b.

Core formula conjecture. The core of II is

core(I)=maIb.\operatorname{core}(I)=\mathfrak{m}^{a}I^{b}.

The conjecture proposes a general formula for the core of this family of integrally closed ideals, extending the motivating example and addressing the failure of core to preserve inclusion. Its resolution is not specified in the supplied text.

Sources & referencesView supporting material

Primary source

Kyungyong Lee, “A short note on containment of cores”, arXiv:math/0703366 (2007).

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