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Given a P 1 conforming or nonconforming Galerkin finite element method (GFEM) solution p h , which approximates the exact solution p of the diffusion-reaction equation −∇ · K∇p + αp = f with full tensor variable coefficient K, we evaluate the approximate flux u h to the exact flux u = −K∇p by a simple but physically intuitive formula over each finite… (More)

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