For kernels with mixed smoothness r>1, the worst-case entropy numbers of the associated L1-to-L∞ integral operator classes decay like k^{-2r} up to logarithmic factors in dimensions one and two.
Carl, Entropy numbers, s-numbers, and eigenvalue problems, J
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Entropy numbers of classes defined by integral operators
For kernels with mixed smoothness r>1, the worst-case entropy numbers of the associated L1-to-L∞ integral operator classes decay like k^{-2r} up to logarithmic factors in dimensions one and two.