On asymptotic models in Banach spaces

Details On asymptotic models in Banach spaces On asymptotic models in Banach spaces

2001-10-14

arxiv.org/abs/math/0110146v1

Mathematics

Functional Analysis

33 pages

Scientific paper

A well known application of Ramsey's Theorem to Banach Space Theory is the notion of a spreading model (e'_i) of a normalized basic sequence (x_i) in a Banach space X. We show how to generalize the construction to define a new creature (e_i), which we call an asymptotic model of X. Every spreading model of X is an asymptotic model of X and in most settings, such as if X is reflexive, every normalized block basis of an asymptotic model is itself an asymptotic model. We also show how to use the Hindman-Milliken Theorem--a strengthened form of Ramsey's Theorem--to generate asymptotic models with a stronger form of convergence.

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