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math.FA2020
Polynomial approximations in a generalized Nyman-Beurling criterion
François Alouges, Sébastien Darses, Erwan Hillion
The Nyman-Beurling criterion, equivalent to the Riemann hypothesis (RH), is an approximation problem in the space of square integrable functions on , involving dilation…
math.FA2015
An elementary approach to the problem of column selection in a rectangular matrix
Stephane Chretien, Sebastien Darses
The problem of extracting a well conditioned submatrix from any rectangular matrix (with normalized columns) has been studied for some time in functional and harmonic analysis; see…