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Proceedings of the American Mathematical Society
Proceedings of the American Mathematical Society
ISSN 1088-6826(online) ISSN 0002-9939(print)

Pre-frame operators, Besselian frames, and near-Riesz bases in Hilbert spaces


Author: James R. Holub
Journal: Proc. Amer. Math. Soc. 122 (1994), 779-785
MSC: Primary 46C05; Secondary 46B15, 47A99
MathSciNet review: 1204376
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Abstract: A problem of enduring interest in connection with the study of frames in Hubert space is that of characterizing those frames which can essentially be regarded as Riesz bases for computational purposes or which have certain desirable properties of Riesz bases. In this paper we study several aspects of this problem using the notion of a pre-frame operator and a model theory for frames derived from this notion. In particular, we show that the deletion of a finite set of vectors from a frame $ \{ {x_n}\} _{n = 1}^\infty $ leaves a Riesz basis if and only if the frame is Besselian (i.e., $ {\sum} _{n = 1}^\infty\,{a_n}{x_n} $ converges $ \Leftrightarrow ({a_n}) \in {l^2}$).


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Additional Information

DOI: http://dx.doi.org/10.1090/S0002-9939-1994-1204376-4
PII: S 0002-9939(1994)1204376-4
Keywords: Frame, Riesz basis, Fredholm operator
Article copyright: © Copyright 1994 American Mathematical Society