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arXiv 2007.08000math.APmath.FA
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齐次分式索伯列夫空间的刻画

Characterisation of homogeneous fractional Sobolev spaces

Lorenzo Brasco, David Gómez-Castro, Juan Luis Vázquez

摘要:

我们的目标是描述齐次分数Sobolev-Slobodecki \u ı空间$\mathcal{D}^{s,p} (\mathbb{R}^n)$及其嵌入,用于$s \in (0,1]$和$p\ge 1$。它们被定义为关于Gagliardo-Slobodecki \u规范的一组光滑且紧支持的检验函数的完备化。对于$s\,p < n$或$s = p = n = 1$,我们表明,$\mathcal{D}^{s,p}(\mathbb{R}^n)$是同构的一个合适的函数空间,而对于$s\,p \ge n$,它是同构的一个空间的等价类的功能,不同的添加剂常数。作为我们的主要工具之一,我们提出了一个Morrey-Campanato不等式,其中Gagliardo-Slobodecki \u控制器从上面控制一个合适的Campanato控制器。

英文摘要:

Our aim is to characterize the homogeneous fractional Sobolev-Slobodecki\uı spaces $\mathcal{D}^{s,p} (\mathbb{R}^n)$ and their embeddings, for $s \in (0,1]$ and $p\ge 1$. They are defined as the completion of the set of smooth and compactly supported test functions with respect to the Gagliardo-Slobodecki\uı seminorms. For $s\,p < n$ or $s = p = n = 1$ we show that $\mathcal{D}^{s,p}(\mathbb{R}^n)$ is isomorphic to a suitable function space, whereas for $s\,p \ge n$ it is isomorphic to a space of equivalence classes of functions, differing by an additive constant. As one of our main tools, we present a Morrey-Campanato inequality where the Gagliardo-Slobodecki\uı seminorm controls from above a suitable Campanato seminorm.

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