Lexicographic homological linear quotients conjecture for powers of cover ideals

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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 k≥0k\geq 0, let HS⁡k((I(G)∨)ℓ)\operatorname{HS}_k((I(G)^\vee)^\ell) be the kkth homological shift ideal of the ℓ\ellth power, and order the variables lexicographically by

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

Lexicographic homological quotients conjecture. For all k≥0k\geq 0 and all ℓ≥1\ell\geq 1, the ideal HS⁡k((I(G)∨)ℓ)\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.

References

Primary source

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

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