Associated primes and syzygies of linked modules
Associated primes and syzygies of linked modules
复制标题
DOI:
10.1216/jca-2019-11-3-301
复制
发表时间:
2016-02
影响因子:
0.6
通讯作者:
Olgur Celikbas;M. Dibaei;Mohsen Gheibi;A. Sadeghi;Ryo Takahashi
中科院分区:
文献类型:
--
作者:
Olgur Celikbas;M. Dibaei;Mohsen Gheibi;A. Sadeghi;Ryo Takahashi
Motivated by the notion of geometrically linked ideals, we show that over a Gorenstein local ring $R$, if a Cohen-Macaulay $R$-module $M$ of grade $g$ is linked to an $R$-module $N$ by a Gorenstein ideal $c$, such that $Ass_R(M)\cap Ass_R(N)=\emptyset$, then $M\otimes_RN$ is isomorphic to direct sum of copies of $R/a$, where $a$ is a Gorenstein ideal of $R$ of grade $g+1$. We give a criterion for the depth of a local ring $(R,m,k)$ in terms of the homological dimensions of the modules linked to the syzygies of the residue field $k$. As a result we characterize a local ring $(R,m,k)$ in terms of the homological dimensions of the modules linked to the syzygies of $k$.