On the minimal space problem and a new result on existence of basic sequences in quasi-Banach spaces

Details On the minimal space problem and a new result on existence of basic sequences in quasi-Banach spaces On the minimal space problem and a new result on existence of basic sequences in quasi-Banach spaces

2012-02-14

arxiv.org/abs/1202.3088v2

Mathematics

Functional Analysis

15 pages. Some typos and mistakes were corrected and references were added

Scientific paper

We prove that if $X$ is a quasi-normed space which possesses an infinite countable dimensional subspace with a separating dual, then it admits a strictly weaker Hausdorff vector topology. Such a topology is constructed explicitly. As an immediate consequence, we obtain an improvement of a well-known result of Kalton-Shapiro and Drewnowski by showing that a quasi-Banach space contains a basic sequence if and only if it contains an infinite countable dimensional subspace whose dual is separating. We also use this result to highlight a new feature of the minimal quasi-Banach space constructed by Kalton. Namely, which all of its $\aleph_0$-dimensional subspaces fail to have a separating family of continuous linear functionals.

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