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arXiv 1702.00712math.AP
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具有混合范数的Triebel-Lizorkin空间的迹问题

On the trace problem for Triebel--Lizorkin spaces with mixed norms

Jon Johnsen, Winfried Sickel

摘要:

本文的主题是欧几里得空间上具有混合Lebesgue范数的索伯列夫空间的迹。具体来说,限制超平面的第一个和最后一个坐标适用于功能属于准齐次,混合范数Lizorkin-Triebel空间;索伯列夫空间从这些特殊情况下获得。空间承认痕迹的分布意义上的特点,除了边界的情况下,这些也包括在第一个变量的情况下。对于第一个变量,证明了迹空间是具有特定和指数的混合范数Lizorkin-Triebel空间.对于最后一个变量,它们被类似地定义为Besov空间。处理包括连续右逆和高阶迹。结果依赖于序列版本的Nikolskij不等式,Marschall不等式的伪微分算子(和傅立叶乘数断言),以及并矢球准则。

英文摘要:

The subject is traces of Sobolev spaces with mixed Lebesgue norms on Euclidean space. Specifically, restrictions to the hyperplanes given by the first and last coordinates are applied to functions belonging to quasi-homogeneous, mixed-norm Lizorkin--Triebel spaces; Sobolev spaces are obtained from these as special cases. Spaces admitting traces in the distribution sense are characterised except for the borderline cases; these are also covered in case of the first variable. With respect to the first variable the trace spaces are proved to be mixed-norm Lizorkin--Triebel spaces with a specific sum exponent. For the last variable they are similarly defined Besov spaces. The treatment includes continuous right-inverses and higher order traces. The results rely on a sequence version of Nikolskij's inequality, Marschall's inequality for pseudo-differential operators (and Fourier multiplier assertions), as well as dyadic ball criteria.

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