English

Associated primes of local cohomology modules of weakly Laskerian modules

Commutative Algebra 2016-09-07 v1

Abstract

The notion of weakly Laskerian modules was introduced recently by the authors. Let RR be a commutative Noetherian ring with identity, \fa\fa an ideal of RR, and MM a weakly Laskerian module. It is shown that if \fa\fa is principal, then the set of associated primes of the local cohomology module H\fai(M)H_{\fa}^i(M) is finite for all i0i\geq 0. We also prove that when RR is local, then \AssR(H\fai(M))\Ass_R(H_{\fa}^i(M)) is finite for all i0i\geq 0 in the following cases: (1) dimR3\dim R\leq 3, (2) dimR/\fa1\dim R/\fa\leq 1, (3) MM is Cohen-Macaulay and for any ideal \fb\fb, with l=\grade(\fb,M)l=\grade(\fb,M), \HomR(R/\fb,H\fbl+1(M))\Hom_R(R/\fb,H_{\fb}^{l+1}(M)) is weakly Laskerian.

Keywords

Cite

@article{arxiv.math/0502074,
  title  = {Associated primes of local cohomology modules of weakly Laskerian modules},
  author = {Kamran Divaani-Aazar and Amir Mafi},
  journal= {arXiv preprint arXiv:math/0502074},
  year   = {2016}
}

Comments

11 pages, to appear in Communications in Algebra