New Characterizations of Fusion Bases and Riesz Fusion Bases in Hilbert Spaces

Details New Characterizations of Fusion Bases and Riesz Fusion Bases in Hilbert Spaces New Characterizations of Fusion Bases and Riesz Fusion Bases in Hilbert Spaces

2012-03-28

arxiv.org/abs/1203.6279v1

Mathematics

Functional Analysis

14 pages

Scientific paper

In this paper we investigate a new notion of bases in Hilbert spaces and similar to fusion frame theory we introduce fusion bases theory in Hilbert spaces. We also introduce a new definition of fusion dual sequence associated with a fusion basis and show that the operators of a fusion dual sequence are continuous projections. Next we define the fusion biorthogonal sequence, Bessel fusion basis, Hilbert fusion basis and obtain some characterizations of them. we study orthonormal fusion systems and Riesz fusion bases for Hilbert spaces. we consider the stability of fusion bases under small perturbations. We also generalized a result of Paley-Wiener [13] to the situation of fusion basis.

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