Herzog–Srinivasan conjectures on generators of initial ideals of numerical semigroups

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Let HH be a numerical semigroup minimally generated by a1<⋯<ana_1<\dots<a_n. Let width⁡(H)=an−a1\operatorname{width}(H)=a_n-a_1, let IH∗I_H^* denote the ideal of initial forms associated to the defining ideal of the semigroup ring K[H]K[H], and let μ(J)\mu(J) denote the minimal number of generators of an ideal JJ. Let H~\widetilde H be the semigroup generated by all integers in the interval [a1,an][a_1,a_n]. Herzog–Srinivasan's generator conjectures. For every numerical semigroup HH,

(i)μ(IH∗)≤(width⁡(H)+12),\text{(i)}\quad \mu(I_H^*)\leq {\operatorname{width}(H)+1\choose 2},

and

(ii)μ(IH∗)≤μ(IH~∗).\text{(ii)}\quad \mu(I_H^*)\leq \mu(I_{\widetilde H}^*).

If true, the second assertion would imply the first, and the interval completion's arithmetic-sequence structure would yield effective bounds. The source gives no resolution status beyond identifying these as conjectures.

References

Primary source

Dumitru I. Stamate, “Betti numbers for numerical semigroup rings”, arXiv:1801.00153 (2018).

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