Fröberg's conjecture on Hilbert series of generic ideals
Fröberg's conjecture on Hilbert series of generic ideals
Let be a polynomial ring, and let be a generic ideal whose generators satisfy . For a power series , write for its truncation at the first nonpositive coefficient. Fröberg's conjecture. The Hilbert series of is
The conjecture predicts the Hilbert series of a generic ideal from the degrees of its generators and is equivalent to the expected maximal-rank behavior of a generic sequence of forms. The surrounding discussion relates it to semi-regular sequences, for which the predicted Hilbert series is known; the conjectural assertion for generic ideals remains unresolved in the stated generality.
Sources & referencesView supporting material
Primary source
Eric Dannetun, “Betti numbers of ideals generated by n+1 powers of general linear forms”, arXiv:2602.19978 (2026).
Additional references
19 papers in this index state this conjecture (2000–2026). The statement above is taken from the most recent of them; the others are arXiv:2504.13591, arXiv:2410.23211, arXiv:2311.05805, arXiv:2309.03855, arXiv:2102.11516, arXiv:1801.01692, arXiv:1711.05014, arXiv:1711.01232, arXiv:1711.05309, arXiv:1604.06820, arXiv:1512.04324, arXiv:1502.06762, and 6 more.
Progress summary
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