Geodesic
Fast Fourier transform in a system of functions that are orthogonal in the sense of Sobolev and generated by the Walsh system
Daghestan Electronic Mathematical Reports, Tome 15 (2021), pp. 55-66.

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Article discusses algorithms and a program for the direct and inverse fast Fourier transform in a Sobolev orthogonal system of functions generated by the Walsh system.
Keywords: fast Fourier transform, system of functions orthogonal in the Sobolev system, Walsh system. 
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     title = {Fast {Fourier} transform in a system of functions that are orthogonal in the sense of {Sobolev} and generated by the {Walsh} system},
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M. G. Magomed-Kasumov; S. R. Magomedov. Fast Fourier transform in a system of functions that are orthogonal in the sense of Sobolev and generated by the Walsh system. Daghestan Electronic Mathematical Reports, Tome 15 (2021), pp. 55-66. http://geodesic.mathdoc.fr/item/DEMR_2021_15_a3/

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