One-point extensions of wild hereditary algebras

Let H be a finite dimensional algebra over an algebraically closed field and let X be a nontrivial H-module. We investigate the Auslander-Reiten quiver of the one-point extensions H[tau(A)(m)X] and prove in particular the existence of a preinjective component for \m\ much greater than 0. (C) 2004 Elsevier Inc. All rights reserved.