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On constructions of strong and uniformly minimal M-bases in Banach spaces

We find a natural class of transformations ("flattened perturbations") of a norming M-basis in a Banach space X, which give a strong norming M-basis in X. This simplifies and generalizes the positive answer to the "strong M-basis problem" solved by P. Terenzi. We also show that in general one cannot achieve uniformly minimality applying standard transformations to a given norming M-basis, despite of the existence in X a uniformly minimal strong M-bases.

preprint1998arXivOpen access
Roman Vershynin
math.FA
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Roman Vershynin

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