Weak Fröberg conjecture for Hilbert series of general ideals

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Let S\mathcal{S} be the polynomial ring in n+1n+1 variables, and let f1,…,fsf_1,\ldots,f_s be general forms of degrees d1,…,dsd_1,\ldots,d_s. Set

I=(f1,…,fs)⊆S.I=(f_1,\ldots,f_s)\subseteq\mathcal{S}.

For a power series P=∑i≥0aitiP=\sum_{i\geq0}a_it^i, define coeff⁡d(P)=ad\operatorname{coeff}_d(P)=a_d; define ⌈P⌉\lceil P\rceil by retaining coefficients until the first negative coefficient and replacing all subsequent coefficients by zero. Weak Fröberg conjecture. For every integer d≥0d\geq0,

coeff⁡d(HSS/I(t))≥coeff⁡d(⌈∏i=1s(1−tdi)(1−t)n+1⌉).\operatorname{coeff}_d\left(\mathrm{HS}_{\mathcal{S}/I}(t)\right)\geq\operatorname{coeff}_d\left(\left\lceil\frac{\prod_{i=1}^s(1-t^{d_i})}{(1-t)^{n+1}}\right\rceil\right).

This weaker inequality is considered as a separate version of Fröberg's conjecture. The source gives no resolution status beyond discussing it in the cited literature.

References

Primary source

Arthur Bik and Alessandro Oneto, “On the strength of general polynomials”, arXiv:2005.08617 (2021).

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