English

Generalizations of Burch Ideals and Ideal-Periodicity

Commutative Algebra 2024-06-07 v1

Abstract

Consider an infinite minimal free resolution of a module MM over a local Noetherian ring RR. It was shown by Eisenbud that if RR is a complete intersection ring, then a minimal resolution is periodic iff it is bounded. Over more general rings, Peeva and Gasharov showed this periodicity does not always hold. However, in every computed example, the sum of nn consecutive ideals of minors of matrices in the resolution is fixed for some nn, asymptotically. We prove this in general for certain Generalized Positive Burch Index Rings, in the sense of Dao, Kobayashi, and Takahashi. In doing so, we develop techniques that begin to explain this periodicity in more generality.

Keywords

Cite

@article{arxiv.2406.03621,
  title  = {Generalizations of Burch Ideals and Ideal-Periodicity},
  author = {Tejas Rao},
  journal= {arXiv preprint arXiv:2406.03621},
  year   = {2024}
}

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15 pages