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  • 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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