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On the degree of compactness of operators acting from function spaces into Banach spaces of type q. (English) Zbl 0507.47015
Forschungsergeb., Friedrich-Schiller-Univ. Jena N/82/50, 12 p. (1982).

47B38 Linear operators on function spaces (general)
46E35 Sobolev spaces and other spaces of “smooth” functions, embedding theorems, trace theorems
46B20 Geometry and structure of normed linear spaces
41A46 Approximation by arbitrary nonlinear expressions; widths and entropy