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Parcourir Publications scientifiques par auteur "Messirdi, BEKKAI"

Parcourir Publications scientifiques par auteur "Messirdi, BEKKAI"

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  • Relationship between the essential quasi-Fredholm spectrum and the closed-range spectrum, An 
    Benharrat, MOHAMMED; Messirdi, BEKKAI (Univ. Oradea Fasc. Mat. XXI (1), 2014)
    J. P. Labrousse [13] studied and characterized in the case of Hilbert spaces, a relation of the essential quasi-Fredholm spectrum and the spectrum de ned by Goldberg in [9] by ec(A) = f 2 C ; R( I 􀀀 A) is not closedg. ...
  • Stability of almost closed operators on a Hilbert space 
    Messirdi, SANAA; Djaa, MUSTAPHA; Messirdi, BEKKAI (Sarajevo J. of Math, 2009)
    We introduce the notion of almost closed linear operators acting in a Hilbert space. This class of operators contains the set of all closed linear operators and is invariant under addition, composition and limits.

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