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arXiv 1907.05136math.AP
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椭圆型方程解关于边界频率的内衰减

Interior decay of solutions to elliptic equations with respect to frequencies at the boundary

Michele Di Cristo, Luca Rondi

摘要:

证明了具有Lipschitz连续系数的散度型椭圆型方程解的内部衰减估计。估计明确地依赖于从边界的距离和适当的概念的频率的狄利克雷边界数据。我们表明,作为在边界处的频率的增长,在域的一个紧凑的子集中的解决方案的一个合适的范数的平方衰减成反比的方式相对于相应的频率。在Lipschitz正则性假设下,这些估计基本上是最优的,并且对于相应的逆边值问题的最优测量的选择具有重要的意义.

英文摘要:

We prove decay estimates in the interior for solutions to elliptic equations in divergence form with Lipschitz continuous coefficients. The estimates explicitly depend on the distance from the boundary and on suitable notions of frequency of the Dirichlet boundary datum. We show that, as the frequency at the boundary grows, the square of a suitable norm of the solution in a compact subset of the domain decays in an inversely proportional manner with respect to the corresponding frequency. Under Lipschitz regularity assumptions, these estimates are essentially optimal and they have important consequences for the choice of optimal measurements for corresponding inverse boundary value problem.

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