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Variational crimes in the finite element method. (English) Zbl 0264.65068
Math. Found. finite Elem. Method Appl. part. differ. Equations, Sympos. Univ. Maryland, Baltimore 1972, 689-710 (1972).

MSC:
65N30 Finite element, Rayleigh-Ritz and Galerkin methods for boundary value problems involving PDEs
35J20 Variational methods for second-order elliptic equations
41A15 Spline approximation
41A25 Rate of convergence, degree of approximation