Geodesic
Absolute completeness of systems of exponentials on convex compact sets
Sbornik. Mathematics, Tome 196 (2005) no. 12, pp. 1801-1814 Cet article a éte moissonné depuis la source Math-Net.Ru

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Approximation using linear combinations of exponentials with special constraints on the coefficients is investigated. A sufficient condition for such approximation is stated in simple geometric terms. 
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I. F. Krasichkov-Ternovskii; G. N. Shilova. Absolute completeness of systems of exponentials on convex compact sets. Sbornik. Mathematics, Tome 196 (2005) no. 12, pp. 1801-1814. http://geodesic.mathdoc.fr/item/SM_2005_196_12_a2/

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