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 Positive answer to the conjecture by Fong and Istratescu Bull. Korean Math. Soc. 2005 Vol. 42, No. 4, 869-873 Printed December 1, 2005 Salah Mecheri and Ahmed Bachir King Saud University College of Science, King Khaled University Abstract : 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 Downloads: Full-text PDF