The averaging lemma

The averaging lemma
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平均引理

DOI:
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发表时间:
2000
期刊:
影响因子:
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通讯作者:
G. Petrova
G. Petrova
中科院分区:
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文献类型:
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作者:
R. DeVore;G. Petrova

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平均引理是在研究非线性迁移方程解的正则性时产生的。本文展示了如何从谐波分析技术,如小波分解,极大函数,插值,可以用来证明平均引理,并建立其清晰度。设f(x,v)是定义在R × Ω上的实值函数,其中Ω是R中的有界区域.在应用中,Ω是一组速度向量。与f相关联,我们有速度平均值,
Averaging lemmas arise in the study of regularity of solutions to nonlinear transport equations. The present paper shows how techniques from Harmonic Analysis, such as wavelet decompositions, maximal functions, and interpolation, can be used to prove averaging lemmas and to establish their sharpness. Let f(x, v) be a real-valued function defined on R × Ω, where Ω is a bounded domain in R. In applications Ω is a set of velocity vectors. Associated to f , we have the velocity average