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Asymptotically hilbertian modular Banach spaces : examples of uncountable categoricity

Henson C. W., Raynaud Y.

Commentationes Mathematicae

2016

Vol 56, No. 1

119--144

We give a criterion ensuring that the elementary class of a modular Banach space E (that is, the class of Banach spaces, some ultrapower of which is linearly isometric to an ultrapower of E) consists of all direct sums E⊕mH, where H is an arbitrary Hilbert space and ⊕m denotes the modular direct sum. Also, we give several families of examples in the class of Nakano direct sums of finite dimensional normed spaces that satisfy this criterion. This yields many new examples of uncountably categorical Banach spaces, in the model theory of Banach space structures.