A dichotomy for subsymmetric basic sequences with applications to Garling spaces

Albiac, F.; Ansorena, J.; Dilworth, S.; Kutzarova, Denka

doi:10.1090/tran/8278

A dichotomy for subsymmetric basic sequences with applications to Garling spaces
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by F. Albiac, J. L. Ansorena, S. J. Dilworth and Denka Kutzarova PDF

Trans. Amer. Math. Soc. 374 (2021), 2079-2106 Request permission

Abstract:

Our aim in this article is to contribute to the study of the structure of subsymmetric basic sequences in Banach spaces (even, more generally, in quasi-Banach spaces). For that we introduce the notion of positionings and develop new tools which lead to a dichotomy theorem that holds for general spaces with subsymmetric bases. As an illustration of how to use this dichotomy theorem we obtain the classification of all subsymmetric sequences in certain types of spaces. To be more specific, we show that Garling sequence spaces have a unique symmetric basic sequence but no symmetric basis and that these spaces have a continuum of subsymmetric basic sequences.

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