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arXiv 1408.3889math.NAcs.NAmath.CA
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自适应方法的收敛速度、贝索夫空间与多级逼近

Convergence rates of adaptive methods, Besov spaces, and multilevel approximation

McGill University(麦吉尔大学)

Tsogtgerel Gantumur

AI总结:

本文研究自适应有限元方法与贝索夫空间的关系,提出多级逼近空间并证明其嵌入性质,同时探讨总误差定义下的自适应逼近类特性。

摘要:

本文探讨了自适应有限元方法与贝索夫空间的关联,指出多级逼近空间在自适应逼近类与贝索夫空间之间起桥梁作用。通过证明多级逼近空间到自适应逼近类的嵌入,补充了Gaspoz和Morin的逆嵌入定理。此外,本文引入总误差定义的自适应逼近类,并通过泛化逼近理论框架,应用于二阶椭圆问题,得到问题解与数据在特定逼近空间中的隶属关系,这些空间与贝索夫空间相关联。

英文摘要:

This paper concerns characterizations of approximation classes associated to adaptive finite element methods with isotropic h-refinements. It is known from the seminal work of Binev, Dahmen, DeVore and Petrushev that such classes are related to Besov spaces. The range of parameters for which the inverse embedding results hold is rather limited, and recently, Gaspoz and Morin have shown, among other things, that this limitation disappears if we replace Besov spaces by suitable approximation spaces associated to finite element approximation from uniformly refined triangulations. We call the latter spaces *multievel approximation spaces*, and argue that these spaces are placed naturally halfway between adaptive approximation classes and Besov spaces, in the sense that it is more natural to relate multilevel approximation spaces with either Besov spaces or adaptive approximation classes, than to go directly from adaptive approximation classes to Besov spaces. In particular, we prove embeddings of multilevel approximation spaces into adaptive approximation classes, complementing the inverse embedding theorems of Gaspoz and Morin. Furthermore, in the present paper, we initiate a theoretical study of adaptive approximation classes that are defined using a modified notion of error, the so-called *total error*, which is the energy error plus an oscillation term. Such approximation classes have recently been shown to arise naturally in the analysis of adaptive algorithms. We first develop a sufficiently general approximation theory framework to handle such modifications, and then apply the abstract theory to second order elliptic problems discretized by Lagrange finite elements, resulting in characterizations of modified approximation classes in terms of memberships of the problem solution and data into certain approximation spaces, which are in turn related to Besov spaces.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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