Abstract
Lower frame bounds for sequences of exponentials are obtained in a special version of Avdonin's theorem on “1/4 in the mean” [1] and in a theorem of Duffin and Schaeffer [4].
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Lindner, A.M. On lower bounds of exponential frames. The Journal of Fourier Analysis and Applications 5, 185–192 (1999). https://doi.org/10.1007/BF01261608
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DOI: https://doi.org/10.1007/BF01261608