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Homological properties of the homology algebra of the Koszul complex of a local ring: Examples and questions
Stockholm University, Faculty of Science, Department of Mathematics.
2016 (English)In: Journal of Algebra, ISSN 0021-8693, E-ISSN 1090-266X, Vol. 465, 399-436 p.Article in journal (Refereed) Published
Abstract [en]

Let R be a local commutative noetherian ring and HKR the homology ring of the corresponding Koszul complex. We study the homological properties of HKR in particular the Avramov spectral sequence. When the embedding dimension of R is four and when R can be presented with quadratic relations we have found 101 cases where this spectral sequence degenerates and only three cases where it does not degenerate. We also determine completely the Hilbert series of the bigraded Tor of these HKR in tables A-D at the end of the paper. We also study some higher embedding dimensions. Among the methods used are the programme BERGMAN by Jörgen Backelin et al, the Macaulay2-package DGAlgebras by Frank Moore, combined with results by Govorov, Clas Löfwall, Victor Ufnarovski and others.

Place, publisher, year, edition, pages
2016. Vol. 465, 399-436 p.
Keyword [en]
Local ring, Koszul complex, Gorenstein rings, Yoneda Ext-algebra, Hilbert series, Macaulay2, Programme BERGMAN
National Category
Algebra and Logic
Research subject
URN: urn:nbn:se:su:diva-132771DOI: 10.1016/j.jalgebra.2016.06.033OAI: diva2:954665
Available from: 2016-08-23 Created: 2016-08-23 Last updated: 2016-09-14Bibliographically approved

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Roos, Jan-Erik
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