中文

Frobenius 扩张上的 Gorenstein 投射与内射维数

K理论与同调 2019-07-15 v4

摘要

RAR\subset A 为环的 Frobenius 扩张。我们证明:(1) 对任意左 AA-模 MMAM_{A}M 是 Gorenstein 投射(内射)的当且仅当其底层左 RR-模 RM_{R}M 是 Gorenstein 投射(内射)的。(2) 若 G-proj.dimAM<\mathrm{G}\text{-}\mathrm{proj.dim}_{A}M<\infty,则 G-proj.dimAM=G-proj.dimRM\mathrm{G}\text{-}\mathrm{proj.dim}_{A}M = \mathrm{G}\text{-}\mathrm{proj.dim}_{R}M,对 Gorenstein 内射维数的对偶结论亦成立。(3) 若该扩张为分裂的,则 G-gldim(A)=G-gldim(R)\mathrm{G}\text{-}\mathrm{gldim}(A)= \mathrm{G}\text{-}\mathrm{gldim}(R)

关键词

引用

@article{arxiv.1801.07305,
  title  = {Gorenstein projective and injective dimensions over Frobenius extensions},
  author = {Wei Ren},
  journal= {arXiv preprint arXiv:1801.07305},
  year   = {2019}
}

备注

A corrigendum version of Comm. Algebra,46(12):5348-5354, 2018. A typo in Proposition 3.2 is fixed, and the assumption that the extension is split is added for Theorem 3.3, 3.4, and Corollary 3.5. arXiv admin note: text overlap with arXiv:1707.05885