Search Results - Spigel, Efim

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    Invertibility symbol for a Banach algebra generated by two idempotents and a shift

    Invertibility symbol for a Banach algebra generated by two idempotents and a shift by Krupnik, Naum, Spigel, Efim

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  2. 2
    Conditions for eigenvectors of a selfadjoint operator-function to form a basis

    Conditions for eigenvectors of a selfadjoint operator-function to form a basis by Matsaev, Vladimir, Spigel, Efim

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