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Entropy numbers, s-numbers, and eigenvalue problems. (English) Zbl 0466.41008

MSC:
41A46 Approximation by arbitrary nonlinear expressions; widths and entropy
47A70 (Generalized) eigenfunction expansions of linear operators; rigged Hilbert spaces
41A35 Approximation by operators (in particular, by integral operators)
42A85 Convolution, factorization for one variable harmonic analysis
47A15 Invariant subspaces of linear operators
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