Dépôt DSpace/Manakin

Parcourir par auteur "Djellouli, Ghouti"

Parcourir par auteur "Djellouli, Ghouti"

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  • Essential spectra and Drazin invertibility of quasisimilar closed operators 
    Messirdi, Bekkai; Djellouli, Ghouti; Azzouz, Abdelhalim (2018)
    The purpose of this paper is to introduce several generalizations of the notion of similarity between closed operators on a Hilbert space, in particular, the notion of quasi-similarity and mutually quasi-similarity. ...
  • On a General Reduction Scheme of Fredholm Operators 
    Messirdi, Bekkai; Djellouli, Ghouti (African Journal Of Mathematical Physics, 2007)
    In this paper we present a new reduction scheme that we can applied to the study of Fredholm operators. We mainly show in a simple and original manner the stability results for Fredholm operators. We also get a fundamental ...
  • Some stronger topologies for closed operators in Hilbert space 
    Djellouli, Ghouti; Messirdi, Sanaa; Messirdi, Bekkai (Int. J. Contemp. Math. Sciences, 2010)
    The purpose of this paper is to introduce some new metrics on the set C(H) of closed densely defined operators on a Hilbert space H and we characterize the closure of the subset of bounded elements of C(H) for these ...
  • A topological characterization of the product of two closed operators 
    Messirdi, Bekkai; Mortad, Mohammed Hichem; Azzouz, Abdelhalim; Djellouli, Ghouti (Colloquium Mathematicum, 2008)
    The purpose of this work is to give a topological condition for the usual product of two closed operators acting in a Hilbert space to be closed

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