Approximation and entropy numbers of embeddings between approximation spaces. (English) Zbl 1396.41027
The authors present significant results concerning the degrees of compactness for the embeddings of the classical two-indexed approximation subspaces in the usual Euclidean spaces, following the approximation and the entropy numbers. As applications, one obtains the compact embeddings for some Besov spaces.
Reviewer: Vasile Postolică (Piatra Neamt)
MSC:
| 41A65 | Abstract approximation theory (approximation in normed linear spaces and other abstract spaces) |
| 46M35 | Abstract interpolation of topological vector spaces |
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