Isotropic and anisotropic a posteriori error estimation of the mixed finite element method for second order operators in divergence form.

This paper presents an a posteriori residual error estimator for the mixed FEM of second order operators using isotropic or anisotropic meshes in R^d, d=2 or 3. The reliability and efficiency of our estimator is established without any regularity assumptions on the solution of our problem.

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