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The dimension of piecewise polynomial spaces, and one-sided approximation. (English) Zbl 0279.65091
Confer. numer. Solution differ. Equations, Dundee 1973, Lect. Notes Math. 363, 144-152 (1974).

65N30 Finite element, Rayleigh-Ritz and Galerkin methods for boundary value problems involving PDEs
65D10 Numerical smoothing, curve fitting
65D15 Algorithms for approximation of functions
41A15 Spline approximation
41A25 Rate of convergence, degree of approximation
35J20 Variational methods for second-order elliptic equations