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arXiv 1707.06804math.AP
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关于有界$\mathbb{A}$ -变差函数的迹算子

On the Trace Operator for Functions of Bounded $\mathbb{A}$-Variation

Dominic Breit, Lars Diening, Franz Gmeineder

摘要:

本文考虑有界$\mathbb A$ -变差函数空间$\mathrm{BV}^{\mathbb A}(Ω)$.对给定的一阶常系数线性齐次微分算子$\mathbb A$,这是$L^1$ -函数$u:Ω\rightarrow\mathbb R^N$空间,使得分布微分表达式$\mathbb A u$是有限(向量)Radon测度.证明了对于Lipschitz域$Ω\subset\mathbb R^{n}$,$\mathrm{BV}^{\mathbb A}(Ω)$ -函数有$L^1(\partialΩ)$ -迹当且仅当$\mathbb A$是$\mathbb C$ -椭圆的(或者等价地,当$\mathbb A$的核是有限维的). $L^1(\partialΩ)$迹的存在以前只在$\mathbb A u$与函数$u$的完全梯度或对称梯度一致的特殊情况下才知道(因此涵盖了特殊情况$\mathrm{BV}$或$\mathrm{BD}$)。作为一个主要的新颖性,我们不使用微积分的基本定理来构造迹算子(这种方法只适用于$\mathrm{BV}$ -和$\mathrm{BD}$ -设置),而是在接近边界时比较零空间上的投影。作为一个例子,我们研究了线性增长的拟凸变分泛函的Dirichlet问题,该问题依赖于$\mathbb A u$ .

英文摘要:

In this paper, we consider the space $\mathrm{BV}^{\mathbb A}(Ω)$ of functions of bounded $\mathbb A$-variation. For a given first order linear homogeneous differential operator with constant coefficients $\mathbb A$, this is the space of $L^1$--functions $u:Ω\rightarrow\mathbb R^N$ such that the distributional differential expression $\mathbb A u$ is a finite (vectorial) Radon measure. We show that for Lipschitz domains $Ω\subset\mathbb R^{n}$, $\mathrm{BV}^{\mathbb A}(Ω)$-functions have an $L^1(\partialΩ)$-trace if and only if $\mathbb A$ is $\mathbb C$-elliptic (or, equivalently, if the kernel of $\mathbb A$ is finite dimensional). The existence of an $L^1(\partialΩ)$-trace was previously only known for the special cases that $\mathbb A u$ coincides either with the full or the symmetric gradient of the function $u$ (and hence covered the special cases $\mathrm{BV}$ or $\mathrm{BD}$). As a main novelty, we do not use the fundamental theorem of calculus to construct the trace operator (an approach which is only available in the $\mathrm{BV}$- and $\mathrm{BD}$-setting) but rather compare projections onto the nullspace as we approach the boundary. As a sample application, we study the Dirichlet problem for quasiconvex variational functionals with linear growth depending on $\mathbb A u$.

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