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arXiv 2005.10740math.APmath.FA
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在双椭圆问题中出现的Sobolev空间中通过正则函数的逼近

Approximation by regular functions in Sobolev spaces arising from doubly elliptic problems

Istituto Nazionale di Alta Matematica (INdAM)(意大利高等数学研究所)

Patrizia Pucci, Enzo Vitillaro

AI总结:

本文研究了在双椭圆问题中出现的Sobolev空间中,通过正则函数逼近的密度结果及其在不同边界条件下的应用。

摘要:

本文讨论了在空间$$W^{k,\ell,p}(Ω;Γ)= \left\{u\in W^{k,p}(Ω): u_{|Γ}\in W^{\ell,p}(Γ)\right\}$$中$C^m(\overlineΩ)$函数的非平凡密度结果,其中$m∈{\mathbb N}∪\{\infty\}$,该空间配备了$(u,u_{|Γ})$在$W^{k,p}(Ω)×W^{\ell,p}(Γ)$中的范数,其中$Ω$是${\mathbb R}^N$($N≥2$)中的有界开集,边界$Γ$具有$C^m$类,$k≤ℓ≤m$且$1≤p<∞$。此类结果在处理涉及两个椭圆算子的双椭圆问题时具有兴趣,其中一个在$Ω$中,另一个在$Γ$上。此外,我们还将考虑在$Γ$的相对开部分上施加齐次Dirichlet边界条件的情况,并作为初步步骤,证明当$Ω={\mathbb R}^N$或$Ω={\mathbb R}^N_+$且$Γ=∂{\mathbb R}^N_+$时的类似结果。

英文摘要:

The paper deals with a nontrivial density result for $C^m(\overlineΩ)$ functions, with $m\in{\mathbb N}\cup\{\infty\}$, in the space $$W^{k,\ell,p}(Ω;Γ)= \left\{u\in W^{k,p}(Ω): u_{|Γ}\in W^{\ell,p}(Γ)\right\},$$ endowed with the norm of $(u,u_{|Γ})$ in $W^{k,p}(Ω)\times W^{\ell,p}(Γ)$, where $Ω$ is a bounded open subset of ${\mathbb R}^N$, $N\ge 2$, with boundary $Γ$ of class $C^m$, $k\le \ell\le m$ and $1\le p<\infty$. Such a result is of interest when dealing with doubly elliptic problems involving two elliptic operators, one in $Ω$ and the other on $Γ$. Moreover we shall also consider the case when a Dirichlet homogeneous boundary condition is imposed on a relatively open part of $Γ$ and, as a preliminary step, we shall prove an analogous result when either $Ω={\mathbb R}^N$ or $Ω={\mathbb R}^N_+$ and $Γ=\partial{\mathbb R}^N_+$. \keywords{Density results\and Sobolev spaces \and Smooth functions \and the Laplace--Beltrami operator.

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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