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
Nedra Moalla, Wafa Selmi · Operators and Matrices · 2022
In this paper, we investigate the stability of some essential spectra of a 3 3 block operator matrices with unbounded entries and with non diagonal domain by using the resolvent of this kind of matrix operator. Furthermore, we give an application from Three-Group transport theory to illustrate the validity of the main results in the Banach space L 1 ([-a,a] [-1,1];dxdv) , a > 0.