Summary
Two families of mixed finite elements, one based on triangles and the other on rectangles, are introduced as alternatives to the usual Raviart-Thomas-Nedelec spaces. Error estimates inL 2 (Ω) andH −5 (Ω) are derived for these elements. A hybrid version of the mixed method is also considered, and some superconvergence phenomena are discussed.
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Brezzi, F., Douglas, J. & Marini, L.D. Two families of mixed finite elements for second order elliptic problems. Numer. Math. 47, 217–235 (1985). https://doi.org/10.1007/BF01389710
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DOI: https://doi.org/10.1007/BF01389710