Lower Bounds for Local Cohomology Modules with Respect to a Pair of Ideals
Lower Bounds for Local Cohomology Modules with Respect to a Pair of Ideals作者机构:Faculty of Science Sayyed Jamaleddin Asadabadi University Postal code: 65418-3-5583 Asadabad Iran Department of Mathematics Imam Khomeini International University Postal code: 34149-1-6818 Qazvin Iran
出 版 物:《Algebra Colloquium》 (代数集刊(英文版))
年 卷 期:2016年第23卷第2期
页 面:329-334页
核心收录:
学科分类:07[理学] 070104[理学-应用数学] 0701[理学-数学]
主 题:extension functor local cohomology Serre subcategory
摘 要:Let R be a Noetherian ring, I and J two ideals of R, M an R-module and t an integer. Let S be a Serre subcategory of the category of R-modules satisfying the co ondition CI, and N be a finitely generated R-module with SuppRN= V(a) for some a ∈ W(I, J). It is shown that if ExtR^J(N,HI^i,J(M)) ∈ S for all i 〈 t and all j 〈 t - i, then Ha^i(M) ∈ S for all i 〈 t. Let S be the class of all R-modules N with divmR N ≤ k, where k is an integer. It is proved that if Ha^i(M) ∈ S for all i 〈 t and all a ∈ W(I, J), then HI^i,j(M) ∈ S for all i 〈 t. It follows that inf{i : HI^i,j(M) S} = inf(inf{i : Ha^i(M) S): a ∈W(I,J)}.