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arXiv 2109.00451math.NAcs.NAmath.AP
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分数次Laplacian积分在分次网格上的构造性逼近

Constructive approximation on graded meshes for the integral fractional Laplacian

Juan Pablo Borthagaray, Ricardo H. Nochetto

摘要:

本文考虑整分数Laplacian算子$(-Δ)^s$的齐次狄利克雷问题.我们证明了Lipschitz域上的最优Sobolev正则性估计,只要解是$C^s$到边界。我们提出了一个贪婪算法的梯度二分法网格的建设,并获得准最佳的收敛速度的近似解决这样的问题,由连续的分段线性函数。非线性Sobolev尺度决定了正则性和可逼近性之间的关系。

英文摘要:

We consider the homogeneous Dirichlet problem for the integral fractional Laplacian $(-Δ)^s$. We prove optimal Sobolev regularity estimates in Lipschitz domains provided the solution is $C^s$ up to the boundary. We present the construction of graded bisection meshes by a greedy algorithm and derive quasi-optimal convergence rates for approximations to the solution of such a problem by continuous piecewise linear functions. The nonlinear Sobolev scale dictates the relation between regularity and approximability.

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