4 papers
Essential Descent Spectrum Equality
Abdelaziz Tajmouati, Hamid Boua
A bounded operator in a Banach space is said to satisfy the essential descent spectrum equality, if the descent spectrum of as an operator on coincides with the ess…
Problem of Descent Spectrum Equality
Abdelaziz Tajmouati, Hamid Boua
Let be the algebra of all bounded operators acting on an infinite dimensional complex Banach space . We say that an operator satisfies th…
Quasi-Fredholm, Saphar Spectra for Integrated Semigroup
Abdelaziz Tajmouati, Hamid Boua, Mohamed Karmouni
In this paper, we show a spectral inclusion of integrated semigroups for Saphar, essentially Saphar and quasi-Fredholm spectra.
Semi-Fredholm and semi-Browder spectrums for the -times integrated semigroups
Abdelaziz Tajmouati, Abdeslam El Bakkali, Mohamed Baba Mohamed Ahmed +1
In this paper, we describe the different spectrums of the α-times integrated semigroups by the spectrums of their generators. Specially, essential ascent and descent, upper and low…