M. Karmouni

collaborators

3 papers

math.FA2019

Generalized Drazin-Riesz Invertibility for Operators Matrices

Abdelaziz Tajmouati, Mohammed Karmouni, Safae Alaoui Chrifi

Let $A \in B (X)$ , $B \in B (Y)$ and $C \in B (Y, X)$ where $X$ and $Y$ are infinite Banach or Hilbert spaces. Let $M_{C}=\begin{pmatrix} A & C\cr 0 & B \end{pm…

math.SP2018

Spectral mapping theorems of differentiable C0 semigroups

Abdelaziz Tajmouati, Hamid Boua, Mohammed Karmouni

Let $(T (t))_{t \geq 0}$ be a $C_{0}$ semigroup on a Banach space $X$ with infinitesimal generator $A$ . In this work, we give conditions for which the spectral mapping theorem $σ_{*}(T…

math.FA2018

Limit Points for Browder Spectrum of Operator Matrices

Abdelaziz Tajmouati, Mohammed Karmouni, Safae Alaoui Chrifi

Let $A \in B (X)$ and $B \in B (Y)$ , where $X$ and $Y$ are Banach spaces, and let $M_{C}$ be an operator acting on $X \oplus Y$ given by $M_C=\begin{pmatrix} A & C \…