Standardly stratified structures from tilting modules

Abstract

Characteristic tilting modules play a central role in the theory of standardly stratified algebras, for instance in Ringel duality. They are constructed from the standard modules, which are determined by a partial order on the simple modules. In this paper, we characterize characteristic tilting modules intrinsically. We show that a tilting module is a characteristic tilting module if and only if the matrix of composition multiplicities of its indecomposable direct summands is triangular with respect to suitable orderings of the summands and of the simple modules. In this case, the standard modules and all the corresponding partial orders are recovered from the tilting module. As an application, we prove that the tilting correspondence of Geiss, Leclerc and Schröer between a GLS path algebra and its associated hereditary algebra restricts to a bijection between characteristic tilting modules. In particular, we obtain GLS path algebras that are not quasi-hereditary with respect to any partial order but for which every tilting module is a characteristic tilting module.