Angles between subspaces and nearly optimal approximation in GFEM
Angles between subspaces and nearly optimal approximation in GFEM
复制标题
GFEM 中子空间和近乎最佳近似之间的角度
DOI:
10.1016/j.cma.2022.115628
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发表时间:
2022
影响因子:
7.2
通讯作者:
Stuebner, Michael
中科院分区:
文献类型:
--
作者:
Lipton, Robert;Sinz, Paul;Stuebner, Michael
Abstract The Generalized Finite Element Methods (GFEM) are known for accurately resolving local features in heterogeneous media. Recent numerical experiments have shown that the use of local bases made from A-harmonic extensions of well chosen boundary data have nearly optimal approximation properties. In this paper we show that the explanation is geometric and given by the angle between any finite dimensional approximation space and the optimal finite dimensional approximation space introduced in (Babǔska and Lipton, 2011). The effect of the angle is quantified by an upper bound on the convergence rate. This rate is seen in the numerical simulations where local bases with nearly optimal approximation properties are identified.
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DOI:
10.1016/j.cma.2020.112960
发表时间:
2019-10
期刊:
ArXiv
影响因子:
--
作者:
I. Babuska;R. Lipton;Paul Sinz;M. Stuebner
通讯作者:
I. Babuska;R. Lipton;Paul Sinz;M. Stuebner
DOI:
--
发表时间:
2014
期刊:
影响因子:
--
作者:
I. Babuska;Xuehai Huang;R. Lipton
通讯作者:
R. Lipton
影响因子:
1.3
作者:
J. Melenk
通讯作者:
J. Melenk
DOI:
--
发表时间:
1968
期刊:
影响因子:
--
作者:
G. Dahlquist;B. Sjöberg;P. Svensson
通讯作者:
P. Svensson
影响因子:
4.1
作者:
R. Lipton;Paul Sinz;M. Stuebner
通讯作者:
M. Stuebner