P Aiena, M Kachad - Rendiconti del Circolo Matematico di Palermo Series …, 2023 - Springer
Abstract Property (UW\scriptstyle Π)(UW Π) for a bounded linear operator T ∈ L (X) T∈ L (X)
on a Banach space X means that the points λ λ of the approximate point spectrum for which …