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Rigidity of Ext and Tor via Flat-Cotorsion Theory
Department of Mathematics and Statistics, Texas Tech University, Lubbock, TX, United States.ORCID iD: 0000-0002-9360-123X
School of Mathematical and Statistical Sciences, University of Texas, Rio Grande Valley, Edinburg, TX, United States.ORCID iD: 0000-0003-2860-6568
Mälardalen University, School of Education, Culture and Communication, Educational Sciences and Mathematics.ORCID iD: 0000-0003-2714-9342
2023 (English)In: Proceedings of the Edinburgh Mathematical Society, ISSN 0013-0915, E-ISSN 1464-3839, Vol. 66, p. 1142-1153Article in journal (Refereed) Published
Abstract [en]

Let be a prime ideal in a commutative noetherian ring R and denote by the residue field of the local ring. We prove that if an R-module M satisfies for some, then holds for all. This improves a result of Christensen, Iyengar and Marley by lowering the bound on n. We also improve existing results on Tor-rigidity. This progress is driven by the existence of minimal semi-flat-cotorsion replacements in the derived category as recently proved by Nakamura and Thompson.

Place, publisher, year, edition, pages
Cambridge University Press , 2023. Vol. 66, p. 1142-1153
Keywords [en]
colocalization, Ext, flat dimension, injective dimension, rigidity, Tor
National Category
Mathematics
Identifiers
URN: urn:nbn:se:mdh:diva-64755DOI: 10.1017/S0013091523000573ISI: 001092768300001Scopus ID: 2-s2.0-85175995431OAI: oai:DiVA.org:mdh-64755DiVA, id: diva2:1812303
Available from: 2023-11-15 Created: 2023-11-15 Last updated: 2023-12-21Bibliographically approved

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Thompson, Peder

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