Auslander-Reiten duality for subcategories

Abstract

Auslander-Reiten duality for module categories is generalized to some sufficiently nice subcategories. In particular, our consideration works for $\mathcal{P}^{<\infty}(\Lambda)$, the subcategory consisting of finitely generated modules with finite projective dimension over an artin algebra $\Lambda$, and also, the subcategory of Gorenstein projectove modules of $\rm{mod}\mbox{-}\Lambda$, denoted by $\rm{Gprj}\mbox{-}\Lambda$. In this paper, we give a method to compute the Auslander-Reiten translation in $\mathcal{P}^{<\infty}(\Lambda)$ whenever $\Lambda$ is a $1$-Gorenstein algebra. In addition, we characterize when the Auslander-Reiten translation in $\rm{Gprj}\mbox{-}\Lambda$ is the first syzygy and provide many algebras having such property.