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arXiv 2602.12007math.AP
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Sobolev空间中Neumann正则光滑函数的密度性研究:子解析流形

Density of Neumann regular smooth functions in Sobolev spaces of subanalytic manifolds

Instytut Matematyki Uniwersytetu Jagiellońskiego(雅盖隆大学数学研究所)

Guillaume Valette

AI总结:

研究子解析流形中Neumann正则函数在Sobolev空间中的密度条件,揭示连通性对函数空间稠密性的影响。

摘要:

我们给出了关于$\mathscr{C}^\infty$子流形$M$在$\mathbb{R}^n$中为有界子解析的情况下,Neumann正则函数空间在Sobolev空间中稠密的特征。所谓Neumann正则函数,是指几乎在边界上处处光滑且梯度与边界相切的函数。当$p\in [1,2]$时,我们证明了$\mathscr{C}^\infty(\overline{M})$中的Neumann正则元素在$W^{1,p}(M)$中稠密当且仅当$M$在几乎每个边界点上是连通的。当$p$较大时,我们展示了$\mathscr{C}^\infty(M)$中的Neumann正则Lipschitz元素在$W^{1,p}(M)$中稠密当且仅当$M$在每个边界点上是连通的。证明涉及构造Lipschitz Neumann正则的单位分解,这在独立研究中具有价值。

英文摘要:

We give characterizations of the bounded subanalytic $\mathscr{C}^\infty$ submanifolds $M$ of $\mathbb{R}^n$ for which the space of Neumann regular functions is dense in Sobolev spaces. By ``Neumann regular function'', we mean a function which is smooth at almost every boundary point and whose gradient is tangent to the boundary. In the case $p\in [1,2]$, we prove that the Neumann regular elements of $\mathscr{C}^\infty(\overline{M})$ are dense in $W^{1,p}(M)$ if and only if $M$ is connected at almost every boundary point. In the case $p$ large, we show that the Neumann regular Lipschitz elements of $\mathscr{C}^\infty(M)$ are dense in $W^{1,p}(M)$ if and only if $M$ is connected at every boundary point. The proof involves the construction of Lipschitz Neumann regular partitions of unity, which is of independent interest.

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