English

DG module structures and minimal free resolutions modulo an exact zero-divisor

Commutative Algebra 2023-06-16 v2

Abstract

Let QQ be a local ring with maximal ideal n\mathfrak{n} and let f,gnn2f,g\in \mathfrak{n}\smallsetminus\mathfrak{n}^2 with fg=0fg=0. When MM is a finite QQ-module with fM=0fM=0, we show that a minimal free resolution of MM over QQ has a differential graded module structure over the differential graded algebra Qy,t(y)=f,(t)=gyQ\langle y,t\mid \partial(y)=f, \partial(t)=gy\rangle. When (f,g)(f,g) is a pair of exact zero divisors, we use this structure to describe a minimal free resolution of MM over Q/(f)Q/(f).

Keywords

Cite

@article{arxiv.2208.04452,
  title  = {DG module structures and minimal free resolutions modulo an exact zero-divisor},
  author = {Liana M. Şega and Deepak Sireeshan},
  journal= {arXiv preprint arXiv:2208.04452},
  year   = {2023}
}

Comments

minor revisions

R2 v1 2026-06-25T01:34:57.586Z