Extremal growth of Betti numbers and trivial vanishing of (co)homology
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- by Justin Lyle and Jonathan Montaño PDF
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Abstract:
A Cohen–Macaulay local ring $R$ satisfies trivial vanishing if $\operatorname {Tor}_i^R(M,N)=0$ for all large $i$ implies that $M$ or $N$ has finite projective dimension. If $R$ satisfies trivial vanishing, then we also have that $\operatorname {Ext}^i_R(M,N)=0$ for all large $i$ implies that $M$ has finite projective dimension or $N$ has finite injective dimension. In this paper, we establish obstructions for the failure of trivial vanishing in terms of the asymptotic growth of the Betti and Bass numbers of the modules involved. These, together with results of Gasharov and Peeva, provide sufficient conditions for $R$ to satisfy trivial vanishing; we provide sharpened conditions when $R$ is generalized Golod. Our methods allow us to settle the Auslander–Reiten conjecture in several new cases. In the last part of the paper, we provide criteria for the Gorenstein property based on consecutive vanishing of Ext. The latter results improve similar statements due to Ulrich, Hanes–Huneke, and Jorgensen–Leuschke.References
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Additional Information
- Justin Lyle
- Affiliation: Department of Mathematics, University of Kansas, 405 Snow Hall, 1460 Jayhawk Boulevard, Lawrence, Kansas 66045
- MR Author ID: 1345188
- ORCID: 0000-0003-4748-4156
- Email: justin.lyle@ku.edu
- Jonathan Montaño
- Affiliation: Department of Mathematical Sciences, New Mexico State University, P.O. Box 3000, Las Cruces, New Mexico 88003-8001
- MR Author ID: 890186
- Email: jmon@nmsu.edu
- Received by editor(s): April 3, 2019
- Received by editor(s) in revised form: March 9, 2020
- Published electronically: August 28, 2020
- © Copyright 2020 American Mathematical Society
- Journal: Trans. Amer. Math. Soc. 373 (2020), 7937-7958
- MSC (2010): Primary 13D07, 13D02, 13C14, 13H10, 13D40
- DOI: https://doi.org/10.1090/tran/8189
- MathSciNet review: 4169678
Dedicated: Dedicated to Professor Bernd Ulrich on the occasion of his sixty-fifth birthday