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Large cardinals and continuity of coordinate functionals of filter bases in Banach spaces

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arxiv 2005.04873 v1 pith:B7JQSGQC submitted 2020-05-11 math.FA math.LO

Large cardinals and continuity of coordinate functionals of filter bases in Banach spaces

classification math.FA math.LO
keywords coordinatefilterfunctionalslargebanachbasescardinalscertain
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Assuming the existence of certain large cardinal numbers, we prove that for every projective filter $\mathscr F$ over the set of natural numbers, $\mathscr{F}$-bases in Banach spaces have continuous coordinate functionals. In particular, this applies to the filter of statistical convergence, thereby we solve a problem by V. Kadets (at least under the presence of certain large cardinals). In this setting, we recover also a result of Kochanek who proved continuity of coordinate functionals for countably generated filters (Studia Math., 2012).

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