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arXiv:1409.8172 [math.LO]AbstractReferencesReviewsResources

Some Banach spaces added by a Cohen real

Mirna Džamonja

Published 2014-09-29Version 1

We study certain Banach spaces that are added in the extension by one Cohen real. Specifically, we show that adding just one Cohen real to any model adds a Banach space of density $\aleph_1$ which does not embed into any such space in the ground model such a Banach space can be chosen to be UG This has consequences on the the isomorphic universality number for Banach spaces of density $\aleph_1$, which is hence equal to $\aleph_2$ in the standard Cohen model and the same is true for UG spaces. Analogous universality results for Banach spaces are true for other cardinals, by a different proof.

Comments: preprint. arXiv admin note: substantial text overlap with arXiv:1308.3640
Categories: math.LO
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