-separation axioms on frames
Jan Paseka (1987)
Acta Universitatis Carolinae. Mathematica et Physica
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Jan Paseka (1987)
Acta Universitatis Carolinae. Mathematica et Physica
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Jan Paseka, Bohumil Šmarda (1990)
Archivum Mathematicum
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Jan Paseka, Bohumil Šmarda (1992)
Czechoslovak Mathematical Journal
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Dinitz, Jeffrey H., Stinson, Douglas R., Zhu, L. (1994)
The Electronic Journal of Combinatorics [electronic only]
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R. Vershynin (2001)
Studia Mathematica
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Every frame in Hilbert space contains a subsequence equivalent to an orthogonal basis. If a frame is n-dimensional then this subsequence has length (1 - ε)n. On the other hand, there is a frame which does not contain bases with brackets.