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Abstract

band-limited functions. The decoders are still convolutional, and thus democratic; in his construction, the rate of the exponential decay of the error, shown here to be necessarily strictly inferior to I, is smaller than I by several orders of magnitude. ACKNOWLEDGMENT The authors would like to thank Ron DeVore and C. Sinan Güntürk for helpful discussions concerning the topic of this paper. They are also grateful to the referees for helpful comments. I. Daubechies would also like to thank the Institute for Advanced Study in Princeton for its hospitality during the writing of this correspondence