4 citations · 6 across the 20 of their papers we have counts for
22 papers
Local Ergodic Theorems for C0-Semigroups
Abdelaziz Tajmouati, Fatih Barki
Let be a -semigroup of bounded linear operators on the Banach space into itself and let be their infinitesimal generator. In this paper, we show…
Generalized Drazin-Riesz Invertibility for Operators Matrices
Abdelaziz Tajmouati, Mohammed Karmouni, Safae Alaoui Chrifi
Let , and where and are infinite Banach or Hilbert spaces. Let $M_{C}=\begin{pmatrix} A & C\cr 0 & B \end{pm…
Semi-Fredholm and Semi-Browder Spectra For -Quasi-Semigroups
Abdelaziz Tajmouati, Youness Zahouan
In this paper, we describe the different spectra of the -quasi-semigroups by the spectra of their generators. Specially, essential ascent and descent,Drazin invertible, upper…
On Orbit Reflexive Tuple of Operators And Weak Orbit Reflexivity
Abdelaziz Tajmouati, Youness Zahouan
In this paper we give a various conditions for which the tuple of commutative bounded linear operators on an infinite dimensional ( re…
Spectral Inclusions Between C0-Quasi-Semigroups and Their Generators
Abdelaziz Tajmouati, Youness Zahouan, Mohamed Ahmed Ould Mohamed Baba
In this paper, we show a spectral inclusion of a different spectra of a C0-quasi-semigroup and its generator and precisely for ordinary, point, approximate point, residual, essenti…
Cesàro-Hypercyclic and Weyl type theorem
Abdelaziz Tajmouati, Mohammed El Berrag
In this paper we study the relations between Cesàro-hypercyclic operators and the operators for which Weyl type theorem holds.
Spectral mapping theorems of differentiable C0 semigroups
Abdelaziz Tajmouati, Hamid Boua, Mohammed Karmouni
Let be a semigroup on a Banach space with infinitesimal generator . In this work, we give conditions for which the spectral mapping theorem $σ_{*}(T…
Limit Points for Browder Spectrum of Operator Matrices
Abdelaziz Tajmouati, Mohammed Karmouni, Safae Alaoui Chrifi
Let and , where and are Banach spaces, and let be an operator acting on given by $M_C=\begin{pmatrix} A & C \…
Riesz Decomposition Relative to C*-Algebra Homomorphisms
Abdelaziz Tajmouati, Abdeslam El Bakkali, Safae Alaoui Chrifi
The aim of the present work is to study the Riesz decomposition relative to a C*-algebra homomorphism T : A --> B. We prove that under some conditions on T, T-Riesz elements can be…
Quasi-fredholm and saphar spectrums for the α-times integrated semigroups
Abdelaziz Tajmouati, Abdeslam El Bakkali, Mohamed Ahmed Mohamed Baba +1
We continue to study -times integrated semigroups. Essentially, we characterize the different spectrums of -times integrated semigroups by the spectrums of their generators.…
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…
Spectra Originated from Fredholm Theory and Browder's Theorem
Mohamed Amouch, Mohamed Karmouni, Abdelaziz Tajmouati
We give a new characterization of Browders theorem through equality between the pseudo B-Weyl spectrum and the generalized Drazin spectrum. Also, we will give conditions under whic…
ON λ-Commuting Operators
Abdelaziz Tajmouati, Abdeslam El Bakkali, M. B. Mohamed Ahmed
In this paper, we study the operator equation for a bounded operator on a complex Hilbert space. We focus on algebraic relations between different operators that inc…
Spectral inclusion for -Semigroups Drazin invertible and Quasi-Fredholm operators
A. Tajmouati, M. Amouch, M. R. F. Z. Alhomidi
Let be a semigroups and be its infinitesimal generator. In this work, we prove that the spectral inclusion for remains true for the Dr…
Pseudo B-Fredholm Operators and Spectral Theory
Abdelaziz Tajmouati, Mohamed Amouch, Mohamed Karmouni
In this paper, we show that every pseudo B-Fredholm operator is a pseudo Fredholm operator. Afterwards, we prove that the pseudo B-Weyl spectrum is empty if and only if the pseudo…
Semigroup and Local Spectral Theory
Abdelaziz Tajmouati, Mohamed Karmouni, Hamid Boua +1
In this paper, we studied some local spectral properties for a Co semigroup and its generator. Some stabilities results are also established.
Pseudo semi B-Fredholm and Generalized Drazin invertible operators Through Localized SVEP
Abdelaziz Tajmouati, Mohamed Karmouni, Mbark Abkari
In this paper, we define and study the pseudo upper and lower semi B-Fredholm of bounded operators in a Banach space. In particular, we prove equality up to between the left…
Generalized Kato Decomposition For Operator Matrices and SVEP
Abdelaziz Tajmouati, Mohamed Karmouni
In this paper, we show that for a bounded linear operator , the corresponding generalized Kato decomposition spectrum satisfies the equality $σ_{gD}(T)=σ_{gK}(T)\cup…
Spectral equality for semigroups
A. Tajmouati, M. Amouch, M. R. F. Alhomidi Zakariya
In this paper, we give conditions for which the semigroups satisfies spectral equality for semiregular, essentially semiregular and semi-Fredholm spectrum. Also, we establish…