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## Studia Mathematica

2003 | 159 | 1 | 67-101
Tytuł artykułu

### On the existence of almost greedy bases in Banach spaces

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EN
We consider several greedy conditions for bases in Banach spaces that arise naturally in the study of the Thresholding Greedy Algorithm (TGA). In particular, we continue the study of almost greedy bases begun in [3]. We show that almost greedy bases are essentially optimal for n-term approximation when the TGA is modified to include a Chebyshev approximation. We prove that if a Banach space X has a basis and contains a complemented subspace with a symmetric basis and finite cotype then X has an almost greedy basis. We show that c₀ is the only $ℒ_{∞}$ space to have a quasi-greedy basis. The Banach spaces which contain almost greedy basic sequences are characterized.
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Tom
Numer
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67-101
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wydano
2003
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autor
• Department of Mathematics, University of South Carolina, Columbia, SC 29208, U.S.A.
autor
• Department of Mathematics, University of Missouri, Columbia, MO 65211, U.S.A.
autor
• Institute of Mathematics, Bulgarian Academy of Sciences, Sofia, Bulgaria
• Department of Mathematics, University of Illinois at Urbana-Champaign, Urbana, IL 61801, U.S.A.
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