Author/Authors :
Pu Zhang، نويسنده , , Shun-Hua Zhang، نويسنده ,
Abstract :
LetAbe a path algebra of tame type over a finite field, letMbe an indecomposableA-module, and let (A) be the composition algebra ofA. The main result in this paper is that [M] (A) if and only ifMis a stone, i.e., Ext1A(M, M) = 0.
