English

On generalized Narita ideals

Commutative Algebra 2025-01-23 v1

Abstract

Let (A,m)(A,\mathfrak{m}) be a Cohen-Macaulay local ring of dimension d2d \geq 2. An m\mathfrak{m}-primary ideal II is said to be a generalized Narita ideal if eiI(A)=0e_i^I(A) = 0 for 2id2 \leq i \leq d. If II is a generalized Narita ideal and MM is a maximal Cohen-Macaulay AA-module then we show eiI(M)=0e_i^I(M) = 0 for 2id2 \leq i \leq d. We also have GI(M)G_I(M) is generalized Cohen-Macaulay. Furthermore we show that there exists cIc_I (depending only on AA and II) such that reg GI(M)cI\text{reg} \ G_I(M) \leq c_I.

Keywords

Cite

@article{arxiv.2501.12819,
  title  = {On generalized Narita ideals},
  author = {Tony J. Puthenpurakal},
  journal= {arXiv preprint arXiv:2501.12819},
  year   = {2025}
}
R2 v1 2026-06-28T21:13:29.719Z