English

Cograde conditions and cotorsion pairs

Rings and Algebras 2019-07-15 v1 Representation Theory

Abstract

Let RR and SS be rings and RωS_R\omega_S a semidualizing bimodule. We study when the double functor \ToriS(ω,\ExtRi(ω,))\Tor^S_i(\omega, \Ext^i_{R}(\omega,-)) preserves epimorphisms and the double functor \ExtRi(ω,\ToriS(ω,))\Ext_{R}^i(\omega, \Tor_i^{S}(\omega,-)) preserves monomorphisms in terms of the (strong) cograde conditions of modules. Under certain cograde condition of modules, we construct two complete cotorsion pairs. In addition, we establish the relation between some relative finitistic dimensions of rings and the right and left projective dimensions of ω\omega.

Keywords

Cite

@article{arxiv.1907.05602,
  title  = {Cograde conditions and cotorsion pairs},
  author = {Xi Tang and Zhaoyong Huang},
  journal= {arXiv preprint arXiv:1907.05602},
  year   = {2019}
}

Comments

46 pages, accepted for publication in Publications of the Research Institute for Mathematical Sciences

R2 v1 2026-06-23T10:19:18.927Z