A classical result of J. Ph. Labrousse (Rev. Roumaine
Math. Pures Appl. 25, 1391-1394, 1980) concerning the symmetric difference
between the essential quasi-Fredholm spectrum and the Goldberg
spectrum of closed operators in Hilbert spaces is extended to the
case of B-Fredholm spectra. The obtained results are used to describe
the essential spectrum and some B-Fredholm spectra of some transport
operators.
Dans ce travail, nous avons pris connaissance de nouveaux concepts comme les équations
intégrales de Fredholm et de Volterra.
Pour la plus part des équations intégrales de Fredholm du premier type, nous ne pouvons ...
Benharrat, Mohammed; Messirdi, Bekkai(International Journal of Analysis and Applications, 2015-08-11)
To be able to refine the completion of C (H1, H2), the of set all closed densely defined linear operators between two Hilbert spaces H1 and H2, we define in this paper some new strictly stronger metrics than the gap metric ...
