Constructing tilting modules

Abstract

We investigate the structure of (infinite dimensional) tilting modules over hereditary artin algebras. For connected algebras of infinite representation type with Grothendieck group of rank n n , we prove that for each 0 ≤ i > n − 1 0 \leq i > n-1 , there is an infinite dimensional tilting module T i T_i with exactly i i pairwise non-isomorphic indecomposable finite dimensional direct summands. We also show that any stone is a direct summand in a tilting module. In the final section, we give explicit constructions of infinite dimensional tilting modules over iterated one-point extensions.