English

About a variation of local cohomology

Commutative Algebra 2021-01-05 v2

Abstract

Let q\mathfrak{q} denote an ideal of a local ring (A,m)(A,\mathfrak{m}). For a system of elements a=a1,,at\underline{a} = a_1,\ldots,a_t such that aiqci,i=1,,t,a_i \in \mathfrak{q}^{c_i}, i = 1, \ldots,t, and nZn \in \mathbb{Z} we investigate a subcomplex resp. a factor complex of the \v{C}ech complex CˇaAM\check{C}_{\underline{a}} \otimes_A M for a finitely generated AA-module MM. We start with the inspection of these cohomology modules that approximate in a certain sense the local cohomology modules Hai(M)H^i_{\underline{a}}(M) for all iNi \in \mathbb{N}. In the case of an m\mathfrak{m}-primary ideal aA\underline{a} A we prove the Artinianness of these cohomology modules and characterize the last non-vanishing among them.

Keywords

Cite

@article{arxiv.1712.10146,
  title  = {About a variation of local cohomology},
  author = {M. Azeem Khadam and Peter Schenzel},
  journal= {arXiv preprint arXiv:1712.10146},
  year   = {2021}
}

Comments

Title is changed; publiahed in J. of Commutative Algebra 12 (2020), 353-370. arXiv admin note: text overlap with arXiv:1712.10144