Geodesic
Essential Approximate Pseudospectra of Multivalued Linear Relations
Kragujevac Journal of Mathematics, Tome 49 (2025) no. 2, p. 267

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One of the fundamental ideas investigated in A. Ammar, A. Jeribi and K. Mahfoudhi in \cite{kam} is that of providing conditions under which the essential approximate pseudospectrum of closed, densely defined linear operators have a relationship with Fredholm theory and perturbation theory. In this paper the approximate pseudospectrum and the essential approximate pseudospectrum of closed, densely defined multivalued linear relations are introduced and studied, and work done in the aforementioned papers are extended to general multivalued linear relations
Classification : 47A53, 47A55, 54B35, 47A13
Keywords: pseudospectrum, approximate pseudospectra, essential approximate pseudospectra, multivalued linear relations 
Aref Jeribi; Kamel Mahfoudhi. Essential Approximate Pseudospectra of Multivalued Linear Relations. Kragujevac Journal of Mathematics, Tome 49 (2025) no. 2, p. 267 . http://geodesic.mathdoc.fr/item/KJM_2025_49_2_a6/
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     title = {Essential {Approximate} {Pseudospectra} of {Multivalued} {Linear} {Relations}},
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