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• W2953381193 abstract "Aldroubi has shown how one can construct any frame $gtu$ starting with one frame $ftu $,using a bounded operator $U$ on $l^2(N)$. We study the overcompleteness of the frames in terms of properties of $U$. We also discuss perturbation of frames in the sense that two frames are ``close'' if a certain operator is compact. In this way we obtain an equivalence relation with the property that members of the same equivalence class have the same overcompleteness. On the other hand we show that perturbation in the Paley-Wiener sense does not have this property. Finally we construct a frame which is norm-bounded below, but which does not contain a Riesz basis.The construction is based on the delicate difference between the unconditional convergence of the frame representation, and the fact that a convergent series in the frame elements need not converge unconditionally." @default.
• W2953381193 created "2019-06-27" @default.
• W2953381193 creator A5020577300 @default.
• W2953381193 creator A5066067609 @default.
• W2953381193 date "1995-09-22" @default.
• W2953381193 modified "2023-09-27" @default.
• W2953381193 title "Frames containing a Riesz basis and preservation of this property under perturbation" @default.
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