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Tên On the finiteness and stability of certain sets of associated prime ideals of local cohomology modules (SCI)
Lĩnh vực Toán học
Tác giả Nguyen Tu Cuong, Nguyen Van Hoang
Nhà xuất bản / Tạp chí Communications in Algebra (SCI) Tập 42 Năm 2014
Số hiệu ISSN/ISBN ISSN: 0092-7872
Tóm tắt nội dung

Let R be a Noetherian local ring, I an ideal of R, and N a finitely generated R-module. Let k≥−1 be an integer and r =\depth_k(I, N) the length of a maximal N-sequence in dimension > k in I defined by Brodmann and Nhan in (2008). For a subset S ⊆ Spec R, we set S_{≥k} = {p ∈ S | \dim(R/p)≥k}. We first prove in this article that \Ass_R(H^j_I(N)_{≥k} is a finite set for all j≤r. Let  N=⊕_{n≥0}N_n be a finitely generated graded R-module, where R is a finitely generated standard graded algebra over R_0=R. Let r be the eventual value of depth_k(I,N_n). Then our second result says that for all l≤r the sets \Union_{j≤l}\Ass_R(H^j_I(N_n)_{≥k} are stable for large n.

 

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