Gorenstein dimension of modules over homomorphisms
Gorenstein dimension of modules over homomorphisms
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DOI:
10.1016/j.jpaa.2005.12.005
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发表时间:
2005-04
影响因子:
0.8
通讯作者:
Lars Christensen;S. Iyengar
中科院分区:
文献类型:
--
作者:
Lars Christensen;S. Iyengar
Given a homomorphism of commutative noetherian rings R→S and an S-module N, it is proved that the Gorenstein flat dimension of N over R, when finite, may be computed locally over S. When, in addition, the homomorphism is local and N is finitely generated over S, the Gorenstein flat dimension equals sup{m∈Z∣TormR(E,N)≠0}, where E is the injective hull of the residue field of R. This result is analogous to a theorem of André on flat dimension.