Criteria for flatness and injectivity
Criteria for flatness and injectivity
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平坦度和注入性的标准
DOI:
10.1007/s00209-011-0910-y
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发表时间:
2012
影响因子:
0.8
通讯作者:
Y. Yao
中科院分区:
文献类型:
--
作者:
N. Epstein;Y. Yao
LetRbe a commutative Noetherian ring. We give criteria for flatness ofR-modules in terms of associated primes and torsion-freeness of certain tensor products. This allows us to develop a criterion for regularity ifRhas characteristicp, or more generally if it has a locally contracting endomorphism. Dualizing, we give criteria for injectivity ofR-modules in terms of coassociated primes and (h-)divisibility of certain Hom-modules. Along the way, we develop tools to achieve such a dual result. These include a careful analysis of the notions of divisibility and h-divisibility (including a localization result), a theorem on coassociated primes across a Hom-module base change, and a local criterion for injectivity.
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