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Diederichs, B. ; Kolountzakis, M.N.* ; Papageorgiou, E.*

How many Fourier coefficients are needed?

Monatsh. Math. 200, 23–42 (2023)
Verlagsversion DOI
Open Access Gold (Paid Option)
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We are looking at families of functions or measures on the torus which are specified by a finite number of parameters N. The task, for a given family, is to look at a small number of Fourier coefficients of the object, at a set of locations that is predetermined and may depend only on N, and determine the object. We look at (a) the indicator functions of at most N intervals of the torus and (b) at sums of at most N complex point masses on the multidimensional torus. In the first case we reprove a theorem of Courtney which says that the Fourier coefficients at the locations 0 , 1 , … , N are sufficient to determine the function (the intervals). In the second case we produce a set of locations of size O(Nlog d-1N) which suffices to determine the measure.
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Publikationstyp Artikel: Journalartikel
Dokumenttyp Wissenschaftlicher Artikel
Schlagwörter Fourier Coefficients ; Interpolation ; Inverse Problem ; Non-harmonic Exponential Sums ; Sparse Exponential Sums
ISSN (print) / ISBN 0026-9255
Quellenangaben Band: 200, Heft: , Seiten: 23–42 Artikelnummer: , Supplement: ,
Verlag Universität Wien
Begutachtungsstatus Peer reviewed
Förderungen Hellenic Foundation for Research and Innovation
University of Crete