PERTURBATION BY INESSENTIAL AND RIESZ ELEMENTS

Published in: Quaestiones Mathematicae
Volume 12 , issue 4 , 1989 , pages: 439–446

DOI: 10.1080/16073606.1989.9632195

Author(s): L. Groenewald Department of Mathematics, Ireland , R.E. Harte Department of Mathematics, South Africa , H. Raubenheimer Department of Mathematics, South Africa

Keywords: 46H05 , 46H10

In this note we study the behaviour of the spectrum and exponential spectrum under perturbation by inessential and Riesz elements.

Input Error