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• W2592060370 abstract "We consider the problem of determining the asymptotic order of the Gelfand numbers of mixed-(quasi-)norm embeddings ℓpb(ℓqd)↪ℓrb(ℓud) given that p≤r and q≤u, with emphasis on cases with p≤1 and/or q≤1. These cases turn out to be related to structured sparsity. We obtain sharp bounds in a number of interesting parameter constellations. Our new matching bounds for the Gelfand numbers of the embeddings of ℓ1b(ℓ2d) and ℓ2b(ℓ1d) into ℓ2b(ℓ2d) imply optimality assertions for the recovery of block-sparse and sparse-in-levels vectors, respectively. In addition, we apply our sharp estimates for ℓpb(ℓqd)-spaces to obtain new two-sided estimates for the Gelfand numbers of multivariate Besov space embeddings in regimes of small mixed smoothness. It turns out that in some particular cases these estimates show the same asymptotic behavior as in the univariate situation. In the remaining cases they differ at most by a loglog factor from the univariate bound." @default.
• W2592060370 created "2017-03-16" @default.
• W2592060370 creator A5009463062 @default.
• W2592060370 creator A5010819277 @default.
• W2592060370 date "2018-10-01" @default.
• W2592060370 modified "2023-10-16" @default.
• W2592060370 title "Gelfand numbers related to structured sparsity and Besov space embeddings with small mixed smoothness" @default.
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• W2592060370 doi "https://doi.org/10.1016/j.jco.2018.05.003" @default.
• W2592060370 hasPublicationYear "2018" @default.
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