
arXiv: 2504.05533
For two countable ordinals α and β, a basis of a Banach space X is said to be (α,β)-quasi-greedy if it is ∙ quasi-greedy, ∙ Sα-unconditional but not Sα+1-unconditional, and ∙ Sβ-democratic but not Sβ+1-democratic. If α or β is replaced with ∞, then the basis is required to be unconditonal or democratic, respectively. Previous work constructed a (0,0)-quasi-greedy basis, an (α,∞)-quasi-greedy basis, and an (∞,α)-quasi-greedy basis. In this paper, we construct (α,β)-quasi-greedy bases for β≤α+1 (except the already solved case α=β=0).
41A65, 46B15, FOS: Mathematics, Functional Analysis, Functional Analysis (math.FA)
41A65, 46B15, FOS: Mathematics, Functional Analysis, Functional Analysis (math.FA)
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