Gorenstein projective modules and Frobenius extensions
Gorenstein projective modules and Frobenius extensions
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Gorenstein 射影模和 Frobenius 扩展
DOI:
10.1007/s11425-017-9138-y
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发表时间:
2017-07
期刊:
影响因子:
--
通讯作者:
Ren Wei
中科院分区:
文献类型:
--
作者:
Ren Wei
We prove that for a Frobenius extension, if a module over the extension ring is Gorenstein projective, then its underlying module over the base ring is Gorenstein projective; the converse holds if the Frobenius extension is either left-Gorenstein or separable (e.g., the integral group ring extension ℤ ⊂ ℤG). Moreover, for the Frobenius extensionR⊂A=R[x]=(x2), we show that: a graded A-module is Gorenstein projective in GrMod(A), if and only if its ungraded A-module is Gorenstein projective, if and only if its underlying R-module is Gorenstein projective. It immediately follows that anR-complex is Gorenstein projective if and only if all its items are Gorenstein projectiveR-modules.
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