Indecomposable pure-injective objects in stable categories of Gorenstein-projective modules over Gorenstein orders

Abstract

We give a result of Auslander-Ringel-Tachikawa type for Gorenstein-projective modules over a complete Gorenstein order. In particular, we prove that a complete Gorenstein order is of finite Cohen-Macaulay representation type if and only if every indecomposable pure-injective object in the stable category of Gorenstein-projective modules is compact.

Appendix by Rosanna Laking. 22 pages