Separable elastic Banach spaces are universal

By Dale E. Alspach, Bünyamin Sarı

http://www.sciencedirect.com/science/article/pii/S0022123615004164

A Banach house X is elastic if there's a consistent ok in order that each time a Banach area Y embeds into X, then there's an embedding of Y into X with consistent ok . We end up that C[0,1] embeds into separable limitless dimensional elastic Banach areas, and for that reason they're common for all separable Banach areas. This confirms a conjecture of Johnson and Odell. The facts makes use of incremental embeddings into X of C(K) areas for countable compact ok of accelerating complexity. to accomplish this we strengthen a generalization of Bourgain's foundation index that applies to unconditional sums of Banach areas and turn out a strengthening of the susceptible injectivity estate of those C(K) that's discovered on distinct reproducible bases.

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Math. 1 (1920) 17–27. [7] E. Odell, Ordinal indices in Banach areas, Extracta Math. 19 (1) (2004) 93–125. [8] A. Pełczyński, On C(S)-subspaces of separable Banach areas, Studia Math. 31 (1968) 513–522. [9] H. P. Rosenthal, The Banach areas C(K), in: W. B. Johnson, J. Lindenstrauss (Eds. ), instruction manual of the Geometry of Banach areas, vol. 2, North-Holland, Amsterdam, 2003, pp. 1547–1600.

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