When are trace ideals finite?
Commutative Algebra
2023-08-01 v3
Abstract
In this paper, we study Noetherian local rings having a finite number of trace ideals. We proved that such rings are of dimension at most two. Furthermore, if the integral closure of , where is the zeroth local cohomology, is equi-dimensional, then the dimension of 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 and those of the endomorphism algebra of the maximal ideal of when has minimal multiplicity.
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