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arXiv 1709.01404math.FA
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非紧Sobolev嵌入到连续函数中的严格s-数

Strict s-numbers of non-compact Sobolev embeddings into continuous functions

Jan Lang, Vít Musil

摘要:

为了限制非紧Sobolev嵌入到连续函数中,我们研究了逼近,Gelfand,Kolmogorov,Bernstein和同构s-数的性质.在一维情形下,得到了上述严格s-数的精确值,在高维情形下,得到了严格s-数渐近行为的精确估计.由于Sobolev型嵌入的s-数的所有已知结果主要是在紧性假设下研究的,因此我们的工作是现有结果的推广,并揭示了s-数在极限情况下的一个有趣的行为,当其中一些(近似,Gelfand和Kolmogorov)有正的下界,而另一些(Bernstein和同构)减少到零。从我们的结果还可以得出,这种限制非紧Sobolev嵌入是严格奇异映射。

英文摘要:

For limiting non-compact Sobolev embeddings into continuous functions we study behavior of Approximation, Gelfand, Kolmogorov, Bernstein and Isomorphism s-numbers. In the one dimensional case the exact values of the above-mentioned strict s-numbers were obtained and in the higher dimensions sharp estimates for asymptotic behavior of strict s-numbers were established. As all known results for s-numbers of Sobolev type embeddings are studied mainly under the compactness assumption then our work is an extension of existing results and reveal an interesting behavior of s-numbers in the limiting case when some of them (Approximation, Gelfand and Kolmogorov) have positive lower bound and others (Bernstein and Isomorphism) are decreasing to zero. From our results also follows that such limiting non-compact Sobolev embeddings are finitely strictly singular maps.

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