On the totally acyclic condition and the Auslander-Reiten Conjecture

Abstract

We prove new cases of the Auslander-Reiten conjecture under the assumption that the base ring satisfies the totally acyclic condition $(\mathbf{tac})$. A consequence of our work is that Auslander-Reiten conjecture holds in the graded setting whenever $R$ is Gorenstein and reduced. We also give an example of a local ring $R$ which does not satisfy $(\mathbf{tac})$ but for which the condition ${\mathrm{Ext}}_R^{i>0}(M,R)=0$ implies $M$ is totally reflexive for any finitely generated $R$-module $M$.

arXiv comment6 pages