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Direct and inverse approximation theorems for the $$p$$-version of the finite element method in the framework of weighted Besov spaces. I: Approximability of functions in the weighted Besov spaces. (English) Zbl 1008.65078

##### MSC:
 65N30 Finite element, Rayleigh-Ritz and Galerkin methods for boundary value problems involving PDEs 35D10 Regularity of generalized solutions of PDE (MSC2000) 65N25 Numerical methods for eigenvalue problems for boundary value problems involving PDEs 46E35 Sobolev spaces and other spaces of “smooth” functions, embedding theorems, trace theorems
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