Abstract and Applied Analysis 
Volume 2007 (2007), Article ID 53060, 7 pages
doi:10.1155/2007/53060
Research Article

The Atkinson Theorem in Hilbert C*-Modules over C*-Algebras of Compact Operators

A. Niknam1,2 and K. Sharifi1

1Department of Mathematics, Ferdowsi University, Mashhad 91775, Iran
2Centre of Excellence in Analysis on Algebraic Structures (CEAAS), Ferdowsi University, Mashhad 91775, Iran

Received 13 August 2007; Accepted 4 November 2007

Recommended by Victor G. Zvyagin

Abstract

The concept of unbounded Fredholm operators on Hilbert C*-modules over an arbitrary C*-algebra is discussed and the Atkinson theorem is generalized for bounded and unbounded Feredholm operators on Hilbert C*-modules over C*-algebras of compact operators. In the framework of Hilbert C*-modules over C*-algebras of compact operators, the index of an unbounded Fredholm operator and the index of its bounded transform are the same.