منابع مشابه
Greedy bases are best for m-term approximation
We study the approximation of a subset K in a Banach space X by choosing first basis B and then using n-term approximation. Into the competition for best bases we enter all unconditional bases for X. We show that if the subset K ⊂ X is well aligned with respect to a greedy basis B then, in certain sense, this basis is the best for this type of approximation. Our result extends the recent result...
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We shall investigate the asymptotic behaviour of the widths of best mterm approximation with respect to Lizorkin-Triebel as well as Besov spaces. Our approach leads to final assertions in all possible situations. Furthermore, we shall also discuss embeddings into the approximation spaces Aq(Lp) with q < ∞. This leads to detailed information on the decay of wavelet coefficients for the elements ...
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The typical paradigm for obtaining a compressed version of a discrete signal represented by a vector x ∈ R is to choose an appropriate basis, compute the coefficients of x in this basis, and then retain only the k largest of these with k < N . If we are interested in a bit stream representation, we also need in addition to quantize these k coefficients. Assuming, without loss of generality, tha...
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ژورنال
عنوان ژورنال: Constructive Approximation
سال: 2012
ISSN: 0176-4276,1432-0940
DOI: 10.1007/s00365-012-9163-1