Abstract
In this paper we give exact values of the best n-term approximation widths of diagonal operators between ℓp(ℕ)and ℓq(ℕ)with 0 < p,q ≤ ∞. The result will be applied to obtain the asymptotic constants of best n-term approximation widths of embeddings of function spaces with mixed smoothness by trigonometric system.
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