English

max-projective modules

Rings and Algebras 2019-03-15 v1

Abstract

A right RR-module MM is called max-projective provided that each homomorphism f:MR/If:M \to R/I where II is any maximal right ideal, factors through the canonical projection π:RR/I\pi : R \to R/I. We call a ring RR right almost-QFQF (resp. right max-QFQF) if every injective right RR-module is RR-projective (resp. max-projective). This paper attempts to understand the class of right almost-QFQF (resp. right max-QFQF) rings. Among other results, we prove that a right Hereditary right Noetherian ring RR is right almost-QFQF if and only if RR is right max-QFQF if and only if R=S×TR=S\times T , where SS is semisimple Artinian and TT is right small. A right Hereditary ring is max-QFQF if and only if every injective simple right RR-module is projective. Furthermore, a commutative Noetherian ring RR is almost-QFQF if and only if RR is max-QFQF if and only if R=A×BR=A \times B, where AA is QFQF and BB is a small ring.

Keywords

Cite

@article{arxiv.1903.05906,
  title  = {max-projective modules},
  author = {Yusuf Alagöz and Engin Büyükaşik},
  journal= {arXiv preprint arXiv:1903.05906},
  year   = {2019}
}

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19 pages