Alireza Vahidi, Ahmad Khaksari, Mohammad Shirazipour
{"title":"Cofiniteness and finiteness of associated prime ideals of generalized local cohomology modules","authors":"Alireza Vahidi, Ahmad Khaksari, Mohammad Shirazipour","doi":"arxiv-2409.05090","DOIUrl":null,"url":null,"abstract":"Let $n$ be a non-negative integer, $R$ a commutative Noetherian ring,\n$\\mathfrak{a}$ an ideal of $R$, $M$ and $N$ two finitely generated $R$-modules,\nand $X$ an arbitrary $R$-module. In this paper, we study cofiniteness and\nfiniteness of associated prime ideals of generalized local cohomology modules.\nIn some cases, we show that $\\operatorname{H}^{i}_{\\mathfrak{a}}(M,X)$ is an\n$(\\operatorname{FD}_{<n},\\mathfrak{a})$-cofinite $R$-module and\n$\\{\\mathfrak{p}\\in\\operatorname{Ass}_R(\\operatorname{H}^{i}_{\\mathfrak{a}}(M,X)):\\dim(R/\\mathfrak{p})\\geq{n}\\}$\nis a finite set for all $i$. If $R$ is semi-local, we observe that\n$\\operatorname{Ass}_R(\\operatorname{H}^{i}_{\\mathfrak{a}}(M,N))$ is finite for\nall $i$ when $\\dim_R(M)\\leq{3}$ or $\\dim_R(N)\\leq{3}$. Also, in some\nsituations, we prove that $\\operatorname{H}^{i}_{\\mathfrak{a}}(M,X)$ is an\n$\\mathfrak{a}$-cofinite $R$-module for all $i$.","PeriodicalId":501475,"journal":{"name":"arXiv - MATH - Commutative Algebra","volume":"31 1","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2024-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"arXiv - MATH - Commutative Algebra","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/arxiv-2409.05090","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
Let $n$ be a non-negative integer, $R$ a commutative Noetherian ring,
$\mathfrak{a}$ an ideal of $R$, $M$ and $N$ two finitely generated $R$-modules,
and $X$ an arbitrary $R$-module. In this paper, we study cofiniteness and
finiteness of associated prime ideals of generalized local cohomology modules.
In some cases, we show that $\operatorname{H}^{i}_{\mathfrak{a}}(M,X)$ is an
$(\operatorname{FD}_{