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arXiv 1706.04796math.AP
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Sobolev映射的Luzin N-性质和测不准原理

On Luzin N-property and uncertainty principle for the Sobolev mappings

Adele Ferone, Mikhail V. Korobkov, Alba Roviello

摘要:

研究了索伯列夫空间W^k_p(R^n,R^d)关于Hausdorff测度的Luzin N-性质.证明了除了一个临界维数值t_*=n-(k-1)p外,N-性质成立,对于这个临界值,N-性质一般不成立,并构造了相应的非平凡反例(基于缺项傅里叶级数理论).然而,如果我们另外假定最高k-导数属于Lorentz空间L_{p,1}而不是L_p,则这个N-性质成立。我们将这些结果也推广到分数索伯列夫空间的情况。同时,我们建立了$N$ -性质的Fubini型定理,并讨论了它们在Morse-Sard定理及其最近推广中的应用.

英文摘要:

We study Luzin N-property with respect to the Hausdorff measures for Sobolev spaces W^k_p(R^n,R^d). We prove that such N-property holds except for one critical dimensional value t_*=n-(k-1)p; for this critical value the N-property fails in general, and we constructed the corresponding nontrivial counterexample (based on the theory of lacunary Fourier series). Nevertheless, this N-property holds if we assume in addition that the highest k-derivatives belongs to the Lorentz space L_{p,1} instead of L_p. We extend these results to the case of fractional Sobolev spaces as well. Also, we establish some Fubini type theorems for $N$-properties and discuss their applications to the Morse--Sard theorem and its recent extensions.

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