Abstract
In this work, we proved that the tensor product of two indecomposable OG-diagrams is indecomposable OG-diagram (Lemma 2.3) and use this result to prove that the tensor product of two almost split sequence is almost split sequence (Theorem 4.2). Also, we study the behavior of the vertices, sources of the indecomposable OG-diagrams constructed by tensor product (Theorem 3.7).