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arXiv 2109.07518math.FAmath.AP
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Sobolev-Lorentz型函数空间中的插值不等式

Interpolation inequalities in function spaces of Sobolev-Lorentz type

Jaeseong Byeon, Hyunseok Kim, Jisu Oh

摘要:

研究了Triebel-Lizorkin-Lorentz空间和Besov-Lorentz空间中的非齐次和齐次插值不等式。首先,我们建立了关于函数空间参数的插值不等式。同时给出了几个关于必要条件的结果。其次,利用插值不等式和嵌入结果,证明了Lorentz空间中分数阶导数的Gagliardo-Nirenberg不等式,当其中一个参数等于1或$\infty$时,该不等式也成立.

英文摘要:

Interpolation inequalities in Triebel-Lizorkin-Lorentz spaces and Besov-Lorentz spaces are studied for both inhomogeneous and homogeneous cases. First we establish interpolation inequalities under quite general assumptions on the parameters of the function spaces. Several results on necessary conditions are also provided. Next, utilizing the interpolation inequalities together with some embedding results, we prove Gagliardo-Nirenberg inequalities for fractional derivatives in Lorentz spaces, which do hold even for the limiting case when one of the parameters is equal to 1 or $\infty$.

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