2 papers
math.FA2021
The sandwich rule for sequences of self-adjoint operators and some applications
Cherifa Chellali, Mohammed Hichem Mortad
In this paper, we mainly deal with sequences of bounded linear operators on Hilbert space. The main result is the so-called squeeze theorem (or sandwich rule) for convergent sequen…
math.FA2014
Commutativity up to a factor for bounded and unbounded operators
Chérifa Chellali, Mohammed Hichem Mortad
In this paper, we further investigate the problem of commutativity up to a factor (or -commutativity) in the setting of bounded and unbounded linear operators in a complex Hilbe…