Singular compactness and definability for $$\Sigma $$-cotorsion and Gorenstein modules
Singular compactness and definability for $$\Sigma $$-cotorsion and Gorenstein modules
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DOI:
10.1007/s00029-020-0543-2
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发表时间:
2018-04
影响因子:
1.4
通讯作者:
J. Šaroch;J. Št’ovíček
中科院分区:
文献类型:
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作者:
J. Šaroch;J. Št’ovíček
We introduce a general version of the singular compactness theorem which makes it possible to show that being a-cotorsion module is a property of the complete theory of the module. As an application of the powerful tools developed along the way, we give a new description of Gorenstein flat modules which implies that, regardless of the ring, the class of all Gorenstein flat modules forms the left-hand class of a perfect cotorsion pair. We also prove the dual result for Gorenstein injective modules.