2 citations · 2 across the 3 of their papers we have counts for
5 papers
Structural properties of 2-C-normal operators
Messaoud Guesba, Ismail Lakehal, Sid Ahmed Ould Ahmed Mahmoud
In this paper, we introduce and study a new class of bounded linear operators on complex Hilbert spaces, which we call 2-C-normal operators. This class is inspired by and closely r…
Spectral properties of (m;n)-isosymmetric multivariable operators
Sid Ahmed Ould Ahmed Mahmoud, Ahmed Bachir, Salah Mecheri +1
Inspired by recent works on -isometric and -symmetric multivariables operators on Hilbert spaces, in this paper we introduce the class of -isosymmetric multivariables…
Davis-Wielandt shells of semi-Hilbertian space operators and its applications
Kais Feki, Sid Ahmed Ould Ahmed Mahmoud
In this paper we generalize the concept of Davis-Wielandt shell of operators on a Hilbert space when a semi-inner product induced by a positive operator is considered. Moreover…
On (N,M)-a-normal And (N, M)-a-quasinormal Semi- Hilbert Space Operators
Samir Al Mohammady, Sid Ahmed Ould Beinane, Sid Ahmed O. Ahmed Mahmoud
The purpose of the paper is to introduce and study a new class of operators on semi-Hilbertian spaces i.e.; spaces generated by positive semidefinite sesquilinear forms. Let H be a…
Classes of operators related to m-isometric operators
Salah Mecheri, Sid Ahmed Ould Ahmed Mahmoud
Isometries played a pivotal role in the development of operator theory, in particular with the theory of contractions and polar decompositions and has been widely studied due to it…