Tame Loci of Certain Local Cohomology Modules

Details Tame Loci of Certain Local Cohomology Modules Tame Loci of Certain Local Cohomology Modules

2011-06-18

arxiv.org/abs/1106.3638v1

Mathematics

Commutative Algebra

15 pages, to appear in Journal of Commutative Algebra

Scientific paper

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

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