Weak Fröberg conjecture for Hilbert series of general ideals

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=i0aitiP=\sum_{i\geq0}a_it^i, define coeffd(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 d0d\geq0,

coeffd(HSS/I(t))coeffd(i=1s(1tdi)(1t)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.

Sources & referencesView supporting material

Primary source

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

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