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Displaying similar documents to “Unconditional decompositions and local unconditional structures in some subspaces of L p , 1≤p<2”

On the structure of Banach spaces with an unconditional basic sequence

Razvan Anisca (2007)

Studia Mathematica

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For a Banach space X with an unconditional basic sequence, one of the following regular-irregular alternatives holds: either X contains a subspace isomorphic to ℓ₂, or X contains a subspace which has an unconditional finite-dimensional decomposition, but does not admit such a decomposition with a uniform bound for the dimensions of the decomposition. This result can be viewed in the context of Gowers' dichotomy theorem.