On complementably universal Banach spaces
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M. Kadec (1971)
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A Banach space X is said to be an extremely non-complex space if the norm equality ∥Id +T 2∥ = 1+∥T 2∥ holds for every bounded linear operator T on X. We show that every extremely non-complex Banach space has positive numerical index, it does not have an unconditional basis and that the infimum of diameters of the slices of its unit ball is positive.
Joan Wick Pelletier, Robert D. Rosebrugh (1979)
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