On a characterization of Jeribi, Rakočević, Schechter, Schmoeger and Wolf essential spectra of a 3⨉3 block operator matrices with non diagonal domain and application

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• Nedra Moalla
• Wafa Selmi

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• Primary
• 47A10
• 47A53
• 34K08

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• 3⨉3 block operator matrices
• non diagonal domain
• Fredholm perturbations
• essential spectra
• three-group transport theory

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