STABILITY OF ESSENTIAL APPROXIMATE POINT SPECTRUM AND ESSENTIAL DEFECT SPECTRUM OF LINEAR OPERATOR

Aymen Ammar, Mohammed Zerai Dhahri, Aref Jeribi

Abstract


In the present paper, we use the notion of measure of
noncompactness to give some results on Fredholm operators and
we establish a ne description of the essential approximate point
spectrum and the essential defect spectrum of a closed densely dened
linear operator.


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