A hereditarily indecomposable Banach space with rich spreading model structure |
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Authors: | Spiros A Argyros Pavlos Motakis |
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Institution: | 1. Faculty of Applied Sciences, Department of Mathematics, National Technical University of Athens, Zografou Campus, 157 80, Athens, Greece
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Abstract: | We present a reflexive Banach space \(\mathfrak{X}_{usm}\) which is Hereditarily Indecomposable and satisfies the following properties. In every subspace Y of \(\mathfrak{X}_{usm}\) there exists a weakly null normalized sequence {y n } n , such that every subsymmetric sequence {z n } n is isomorphically generated as a spreading model of a subsequence of {y n } n . Also, in every block subspace Y of \(\mathfrak{X}_{usm}\) there exists a seminormalized block sequence {z n } and \(T:\mathfrak{X}_{usm} \to \mathfrak{X}_{usm}\) an isomorphism such that for every n ∈ ?, T(z 2n?1) = z 2n . Thus the space is an example of an HI space which is not tight by range in a strong sense. |
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