English

Tame Loci of Certain Local Cohomology Modules

Commutative Algebra 2011-06-21 v1 Algebraic Geometry

Abstract

Let MM be a finitely generated graded module over a Noetherian homogeneous ring R=nN0RnR = \bigoplus_{n \in \mathbb{N}_0}R_n. For each iN0i \in \mathbb{N}_0 let HR+i(M)H^i_{R_{+}}(M) denote the ii-th local cohomology module of MM with respect to the irrelevant ideal R+=n>0RnR_+ = \bigoplus_{n > 0} R_n of RR, furnished with its natural grading. We study the tame loci \fti(M)3\ft^i(M)^{\leq 3} at level iN0i \in \mathbb{N}_0 in codimension 3\leq 3 of MM, that is the sets of all primes \fp0R0\fp_0 \subset R_0 of height 3\leq 3 such that the graded R\fp0R_{\fp_0}-modules HR+i(M)\fp0H^i_{R_{+}}(M)_{\fp_0} are tame.

Keywords

Cite

@article{arxiv.1106.3638,
  title  = {Tame Loci of Certain Local Cohomology Modules},
  author = {Markus Brodmann and Maryam Jahangiri},
  journal= {arXiv preprint arXiv:1106.3638},
  year   = {2011}
}

Comments

15 pages, to appear in Journal of Commutative Algebra