Atefeh Hasan-Zadeh - Fouman Faculty of Engineering, College of Engineering, University of Tehran, Iran

In this paper, some of the most important results for partial isometries andC*-subalgebras of them have been studied. Main result shows that theC*-subalgebras generated by a finite set of partial isometries in a fixed operator algebra ?B(�H�) is characterized by matricial graph C*- algebras. This fact has been considered in the operator-valued case.

∗C*-algebras, Partial isometry, Matricial graph, graph-family