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On a generalization of two results of Happel to commutative rings (2208.12137v1)
Published 25 Aug 2022 in math.AC and math.RT
Abstract: In this paper we extend two results of Happel to commutative rings. Let $(A, \mathfrak{m})$ be a commutative Noetherian local ring. Let $Db_f(mod \ A)$ be the bounded derived category of complexes of finitely generated modules over $A$ with finite length cohomology. We show $Db_f( mod \ A)$ has Auslander-Reiten(AR)-triangles if and only if $A$ is regular. Let $Kb_f(proj \ A)$ be the homotopy category of finite complexes of finitely generated free $A$-modules with finite length cohomology. We show that if $A$ is complete and if $A$ is Gorenstein then $Kb_f( proj \ A)$ has AR triangles. Conversely we show that if $Kb_f(proj \ A)$ has AR triangles and if $A$ is Cohen-Macaulay or if $\dim A = 1$ then $A$ is Gorenstein.