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      Extended eigenvalues for Cesàro operators 

      Lacruz Martín, Miguel Benito; León Saavedra, Fernando; Petrovic, Srdjan; Zabeti, Omid (Elsevier, 2015-09-15)
      A complex scalar λ is said to be an extended eigenvalue of a bounded linear operator T on a complex Banach space if there ...
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      Extended eigenvalues of composition operators 

      Lacruz Martín, Miguel Benito; León Saavedra, Fernando; Petrovic, Srdjan; Rodríguez Piazza, Luis (Elsevier, 2021-12-15)
      A complex scalar λ is said to be an extended eigenvalue of a bounded linear operator A on a complex Hilbert space if there ...