Bulletin of the
Korean Mathematical Society BKMS

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Bull. Korean Math. Soc. 2005; 42(4): 869-873

Printed December 1, 2005

Copyright © The Korean Mathematical Society.

Positive answer to the conjecture by Fong and Istratescu

Salah Mecheri and Ahmed Bachir

King Saud University College of Science, King Khaled University

Abstract

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In this note we give a positive answer to the conjecture by Fong and Istratescu.

Keywords: Hermitian operator, hyponormal operators, ($WN$) class, quasinilpotent operator

MSC numbers: Primary 47A10, 47A30, 47B20; Secondary 47B10

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