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arXiv 2003.05216math.FAmath.CA
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Sobolev范数的一个令人惊讶的公式

A surprising formula for Sobolev norms

Haim Brezis, Jean Van Schaftingen, Po-Lam Yung

摘要:

我们建立了Sobolev半范数$\|\nabla u\|_{L^p}$和一个量之间的等价性,该量是在$s = 1$计算的Gagliardo半范数$|u|_{W^{s,p}}$中用弱$L^p$范数替换强$L^p$时得到的。作为推论,我们得到替代估计在一些特殊情况下(涉及$W^{1,1}$),“预期”分数Sobolev和Gagliardo-Nirenberg不等式失败。

英文摘要:

We establish the equivalence between the Sobolev semi-norm $\|\nabla u\|_{L^p}$ and a quantity obtained when replacing the strong $L^p$ by a weak $L^p$ norm in the Gagliardo semi-norm $|u|_{W^{s,p}}$ computed at $s = 1$. As corollaries we derive alternative estimates in some exceptional cases (involving $W^{1,1}$) where the "anticipated" fractional Sobolev and Gagliardo-Nirenberg inequalities fail.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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