Lexicographic homological linear quotients conjecture for powers of cover ideals

Let GG be a Cohen--Macaulay very well--covered graph with 2n2n vertices, and let I(G)I(G)^\vee be its cover ideal. For each k0k\geq 0, let HSk((I(G)))\operatorname{HS}_k((I(G)^\vee)^\ell) be the kkth homological shift ideal of the \ellth power, and order the variables lexicographically by

xn>yn>xn1>yn1>>x1>y1.x_n>y_n>x_{n-1}>y_{n-1}>\dots>x_1>y_1.

Lexicographic homological quotients conjecture. For all k0k\geq 0 and all 1\ell\geq 1, the ideal HSk((I(G)))\operatorname{HS}_k((I(G)^\vee)^\ell) has linear quotients with respect to the lexicographic order induced by this variable order.

This is a refinement of the paper's broader conjecture that all powers of the cover ideal have homological linear quotients. The source gives no evidence that either conjecture has been resolved.

Sources & referencesView supporting material

Primary source

Marilena Crupi and Antonino Ficarra, “Very well-covered graphs by Betti splittings”, arXiv:2303.15362 (2023).

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