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首页> 外文期刊>Journal of complexity >Optimal approximation of elliptic problems by linear and nonlinear mappings Ⅰ
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Optimal approximation of elliptic problems by linear and nonlinear mappings Ⅰ

机译:线性和非线性映射对椭圆问题的最佳逼近Ⅰ

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摘要

We study the optimal approximation of the solution of an operator equation A(u) = f by linear mappings of rank n and compare this with the best n-term approximation with respect to an optimal Riesz basis. We consider worst case errors, where f is an element of the unit ball of a Hilbert space. We apply our results to boundary value problems for elliptic PDEs that are given by an isomorphism A: H_0~s(Ω) → H~(-s)(Ω),where s > 0 and Ω isan arbitrary bounded Lipschitz domain in R~d. We prove that approximation by linear mappings is as good as the best n-term approximation with respect to an optimal Riesz basis. We discuss why nonlinear approximation still is important for the approximation of elliptic problems.
机译:我们通过等级n的线性映射研究算子方程A(u)= f的解的最佳逼近,并将其与关于最佳Riesz基的最佳n项逼近进行比较。我们考虑最坏情况的错误,其中f是希尔伯特空间的单位球的元素。我们将结果应用于同构A给出的椭圆PDE的边值问题:H_0〜s(Ω)→H〜(-s)(Ω),其中s> 0且Ω是R〜中的任意有界Lipschitz域d。我们证明,相对于最优Riesz基,线性映射的逼近与最佳n项逼近一样好。我们讨论了为什么非线性逼近对于椭圆问题的逼近仍然很重要。

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