## 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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### References:

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