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Superconvergence for triangular order $$k=1$$ Raviart-Thomas mixed finite elements and for triangular standard quadratic finite element methods. (English) Zbl 0948.65120
A unified approach to superconvergence for mixed and standard finite elements that can be successfully applied to the second-order $$k=1$$ mixed and the standard quadratic triangular cases is given, and is shown to be supported by numerical experiments.

##### MSC:
 65N30 Finite element, Rayleigh-Ritz and Galerkin methods for boundary value problems involving PDEs 65N12 Stability and convergence of numerical methods for boundary value problems involving PDEs 35J25 Boundary value problems for second-order elliptic equations
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