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Constructive polynomial approximation in Sobolev spaces. (English) Zbl 0456.65003
Recent advances in numerical analysis, Proc. Symp., Madison/Wis. 1978, 31-44 (1978).

65D07 Numerical computation using splines
65N30 Finite element, Rayleigh-Ritz and Galerkin methods for boundary value problems involving PDEs
46E35 Sobolev spaces and other spaces of “smooth” functions, embedding theorems, trace theorems
41A10 Approximation by polynomials
41A15 Spline approximation