Geodesic
Bases in Sobolev Spaces on Bounded Domains with Lipschitzian Boundary
Matematičeskie zametki, Tome 72 (2002) no. 3, pp. 408-417.

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In the Sobolev space $W_p^k(\Omega )$, where $\Omega$ is a bounded domain in $\mathbb R^n$ with a Lipschitzian boundary, for an arbitrarily given $m\in \mathbb N$, we construct a basis such that the error of approximation of a function $f\in W_p^k(\Omega )$ the $N$th partial sum of its expansion with respect to this basis can be estimated in terms of the modulus of smoothness $\omega _m(D^kf,N^{-1/n})_{L_p(\Omega )}$ of order $m$. 
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     author = {O. V. Matveev},
     title = {Bases in {Sobolev} {Spaces} on {Bounded} {Domains} with {Lipschitzian} {Boundary}},
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O. V. Matveev. Bases in Sobolev Spaces on Bounded Domains with Lipschitzian Boundary. Matematičeskie zametki, Tome 72 (2002) no. 3, pp. 408-417. http://geodesic.mathdoc.fr/item/MZM_2002_72_3_a8/

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