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arXiv 0906.3875math.AP
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具有光滑和非光滑系数的椭圆型方程组的迹、扩张、余法导数及解的正则性

Traces, extensions, co-normal derivatives and solution regularity of elliptic systems with smooth and non-smooth coefficients

S. E. Mikhailov

摘要:

对于索伯列夫空间$H^s(Ω)$,1/2<s<3/2的函数,考虑了非唯一广义和唯一正则余法导数的定义,这些定义与偏微分算子及其右手边从定义了它们的域$Ω$到不定义它们的域边界的可能扩张有关.修正了边值问题的设置,使其对同法导数不敏感的固有非唯一性。给出了关于迹算子估计、索伯列夫空间特征和非光滑系数偏微分方程解的正则性的一些新事实。

英文摘要:

For functions from the Sobolev space $H^s(Ω)$, 1/2<s<3/2, definitions of non-unique generalised and unique canonical co-normal derivative are considered, which are related to possible extensions of a partial differential operator and its right hand side from the domain $Ω$, where they are prescribed, to the domain boundary, where they are not. Revision of the boundary value problem settings, which makes them insensitive to the co-normal derivative inherent non-uniqueness are given. Some new facts about trace operator estimates, Sobolev spaces characterisations, and solution regularity of PDEs with non-smooth coefficients are also presented.

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