English

When are trace ideals finite?

Commutative Algebra 2023-08-01 v3

Abstract

In this paper, we study Noetherian local rings RR having a finite number of trace ideals. We proved that such rings are of dimension at most two. Furthermore, if the integral closure of R/HR/H, where HH is the zeroth local cohomology, is equi-dimensional, then the dimension of RR is at most one. In the one-dimensional case, we can reduce to the situation that rings are Cohen-Macaulay. Then, we give a necessary condition to have a finite number of trace ideals in terms of the value set obtained by the canonical module. We also gave the correspondence between trace ideals of RR and those of the endomorphism algebra of the maximal ideal of RR when RR has minimal multiplicity.

Keywords

Cite

@article{arxiv.2108.00414,
  title  = {When are trace ideals finite?},
  author = {Shinya Kumashiro},
  journal= {arXiv preprint arXiv:2108.00414},
  year   = {2023}
}

Comments

12 pages. We modified the statement of Theorem 2.6

R2 v1 2026-06-24T04:43:33.147Z