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Paper's Title:

On operators for which T2≥-T*2


Messaoud Guesba1 and Mostefa Nadir2

1Department of Mathematics,
University of El Oued 39000,

2Department of Mathematics,
University of Msila 28000,


In this paper we introduce the new class of operators for which T2 -T*2 acting on a complex Hilbert space H. We give some basic properties of these operators. we study the relation between the class and some other well known classes of operators acting on H.

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