English

Artinian and noetherian partial skew groupoid rings

Rings and Algebras 2016-10-12 v2 Operator Algebras

Abstract

Let α={αg:Rg1Rg}gmor(G)\alpha = \{ \alpha_g : R_{g^{-1}} \rightarrow R_g \}_{g \in \textrm{mor}(G)} be a partial action of a groupoid GG on a non-associative ring RR and let S=RαGS = R \star_{\alpha} G be the associated partial skew groupoid ring. We show that if α\alpha is global and unital, then SS is left (right) artinian if and only if RR is left (right) artinian and Rg={0},R_g = \{ 0 \}, for all but finitely many gmor(G)g \in \textrm{mor}(G). We use this result to prove that if α\alpha is unital and RR is alternative, then SS is left (right) artinian if and only if RR is left (right) artinian and Rg={0},R_g = \{ 0 \}, for all but finitely many gmor(G)g \in \textrm{mor}(G). Both of these results apply to partial skew group rings, and in particular they generalize a result by J. K. Park for classical skew group rings, i.e. the case when RR is unital and associative, and GG is a group which acts globally on RR. Moreover, we provide two applications of our main result. Firstly, we generalize I. G. Connell's classical result for group rings by giving a characterization of artinian (non-associative) groupoid rings. This result is in turn applied to partial group algebras. Secondly, we give a characterization of artinian Leavitt path algebras. At the end of the article, we use globalization to analyse noetherianity and artinianity of partial skew groupoid rings as well as establishing two Maschke-type results, thereby generalizing results by Ferrero and Lazzarin from the group graded case to the groupoid situation.

Keywords

Cite

@article{arxiv.1603.02237,
  title  = {Artinian and noetherian partial skew groupoid rings},
  author = {Patrik Nystedt and Johan Öinert and Héctor Pinedo},
  journal= {arXiv preprint arXiv:1603.02237},
  year   = {2016}
}

Comments

18 pages. Replacement of the previous version; "Artinian partial skew groupoid rings"

R2 v1 2026-06-22T13:05:38.799Z