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Computing the complexity of the relation of isometry between separable Banach spaces
Author(s) -
Melleray Julien
Publication year - 2007
Publication title -
mathematical logic quarterly
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.473
H-Index - 28
eISSN - 1521-3870
pISSN - 0942-5616
DOI - 10.1002/malq.200610032
Subject(s) - mathematics , separable space , isometry (riemannian geometry) , relation (database) , banach space , borel equivalence relation , pure mathematics , discrete mathematics , borel measure , mathematical analysis , computer science , data mining , probability measure
We compute here the Borel complexity of the relation of isometry between separable Banach spaces, using results of Gao, Kechris [2], Mayer‐Wolf [5], and Weaver [8]. We show that this relation is Borel bireducible to the universal relation for Borel actions of Polish groups. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)