English

A change of rings result for Matlis reflexivity

Commutative Algebra 2019-09-12 v1

Abstract

Let RR be a commutative Noetherian ring and EE the minimal injective cogenerator of the category of RR-modules. An RR-module MM is (Matlis) reflexive if the natural evaluation map MHomR(HomR(M,E),E)M \to \operatorname{Hom}_R(\operatorname{Hom}_R(M,E),E) is an isomorphism. We prove that if SS is a multiplicatively closed subset of RR and MM is a reflexive RR-module, then MM is a reflexive RSR_S-module. The converse holds when SS is the complement of the union of finitely many minimal primes of RR, but fails in general.

Keywords

Cite

@article{arxiv.1510.04156,
  title  = {A change of rings result for Matlis reflexivity},
  author = {Douglas Dailey and Thomas Marley},
  journal= {arXiv preprint arXiv:1510.04156},
  year   = {2019}
}