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Abstract
A new recovery method of rectangular edge finite element approximation for Maxwell’s equations is proposed by using the local symmetry projection. The recovery method is applied to the Nedelec interpolation to obtain the superconvergence of postprocessed Nedelec interpolation. Combining with the superclose result between the Nedelec interpolation and edge finite element approximation, it is shown that the postprocessed edge finite element solution superconverges to the exact solution. Numerical examples are presented to illustrate our theoretical analysis.
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