Extension of the upper bound for Hilbert coefficients of Gorenstein modules

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Let MM be a finitely generated graded Gorenstein RR-module, minimally generated by homogeneous elements of degree zero. Let s=codim⁡Ms=\operatorname{codim} M and k=⌊s2⌋k=\left\lfloor\frac{s}{2}\right\rfloor. Let β0(M)\beta_0(M) denote the minimal number of generators of MM, and write m=(ti)i=0,…,sm=(t_i)_{i=0,\ldots,s}. Let t~\tilde t be the modified degree sequence used in the upper-bound theorem, and let Ψtfj(t~)\Psi_{t}f_j(\tilde t) denote the corresponding bound for the jj-th Hilbert coefficient. Extension conjecture. For all 0≤j≤d−10\leq j\leq d-1, one has

ej(M)≤β0(M)(s+1)!Ψtfj(t~).e_j(M)\leq\frac{\beta_0(M)}{(s+1)!}\Psi_{t}f_j(\tilde t).

The preceding result establishes the analogous upper bound for the first Hilbert coefficient e1(M)e_1(M); the conjecture proposes its extension to all Hilbert coefficients in the stated range. The notation Ψtfj\Psi_t f_j and the precise construction of t~\tilde t are not defined in the supplied span, so the full bound requires checking against the paper.

References

Primary source

Sabine El Khoury, Manoj Kummini and Hema Srinivasan, “An Upper Bound for the First Hilbert Coefficient of Gorenstein Algebras and Modules”, arXiv:2012.13517 (2020).

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