Journal of Pure and Applied Mathematics: Advances and ApplicationsAuthor's: A. BACHIR
Pages: [61] - [73]
Received Date: July 14, 2009
Submitted by:
Let A be a bounded linear operator acting on infinite
dimensional separable Hilbert space 
This paper has two purposes, the first is
to give a large class of operators verifying 
and generalize Stampfli’s results. The
second purpose is to give a large class of operators verifying
and generalize Ho’s results.
hyponormal operators, 
class, derivation, finite operator.
