Mathematics – Functional Analysis
Scientific paper
2011-05-13
Mathematics
Functional Analysis
41 pages, no figures
Scientific paper
Extending the classical notion of the spreading model, the $k$-spreading models of a Banach space are introduced, for every $k\in\mathbb{N}$. The definition, which is based on the $k$-sequences and plegma families, reveals a new class of spreading sequences associated to a Banach space. Most of the results of the classical theory are stated and proved in the higher order setting. Moreover, new phenomena like the universality of the class of the 2-spreading models of $c_0$ and the composition property are established. As consequence, a problem concerning the structure of the $k$-iterated spreading models is solved.
Argyros Spiros A.
Kanellopoulos Vassiliki
Tyros Konstantinos
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