Let k be an algebraically closed field and A be a basic finite-dimensional k-algebra of the form a=kQ/I, where Q is a quiver (=finite oriented graph) and I is an admissible ideal of the path albebra kQ, see  . In this work we assume that Q has no oriented cycles. ...
Tsukuba journal of mathematics 20 (2), 457-469, 1996-12
Institute of Mathematics, University of Tsukuba