activity
20152022
most citedOn pseudo B-Weyl operators and generalized Drazin invertibility for operator matrices

1 citations · 1 across the 5 of their papers we have counts for

collaborators
Showing math.SPShow all

2 papers · 1 filter

math.SP2022

Almost invertible operators

Zakariae Aznay, Abdelmalek Ouahab, Hassan Zariouh

We prove that a bounded linear operator is a direct sum of an invertible operator and an operator with at most countable spectrum iff $0\notin\mbox{acc}^{ω_{1}}\,σ(T),$ where $…

math.SP2021

On the class -operators

Zakariae Aznay, Hassan Zariouh

It is well known that an hyponormal operator satisfies Weyl's theorem. A result due to Conway shows that the essential spectrum of a normal operator consists precisely of all p…