Non-Koszul ghost-term linkage conjecture for relatively compressed level algebras

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Let R=k[x1,…,xn]R=k[x_1,\ldots,x_n] and let c⊂R{\mathfrak c}\subset R be a general complete intersection with fixed generator degrees. Let A=R/IA=R/I be a relatively compressed level quotient of R/cR/{\mathfrak c} of socle degree at least 22 and socle dimension c≥1c\geq1. Assume either n=3n=3 and c≥2c\geq2, or n≥4n\geq4. Non-Koszul ghost-term linkage conjecture. If the minimal free resolution of R/IR/I has non-Koszul ghost terms, then II is linked in two steps—first by c{\mathfrak c} and then by a predictable complete intersection—to an ideal containing at least two independent linear forms. The conjecture proposes that all non-Koszul ghost terms in the stated range arise through this linkage mechanism; the source gives examples with the asserted property but no proof in general.

References

Primary source

Juan C. Migliore, Rosa Miró-Roig and Uwe Nagel, “Minimal Resolution of Relatively Compressed Level Algebras”, arXiv:math/0403045 (2004).

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