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Compact operators and approximation spaces. (English) Zbl 1301.41024
Summary: We investigate compact operators between approximation spaces, paying special attention to the limit case. Applications are given to embeddings between Besov spaces.
MSC:
41A65 Abstract approximation theory (approximation in normed linear spaces and other abstract spaces)
46E35 Sobolev spaces and other spaces of “smooth” functions, embedding theorems, trace theorems
47B07 Linear operators defined by compactness properties
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