The lowest-order rectangular Raviart-Thomas element for Laplace eigenvalues exhibits supercloseness to interpolated solutions enabling one-order accuracy gains via post-processing, error expansions supporting Richardson extrapolation and above-convergence proofs, plus equivalence to enriched rotated
In Mathematical Aspects of Finite Element Methods.Springer Berlin Heidelberg, 292–315, (1977)
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Refined convergence structures of the rectangular Raviart-Thomas element
The lowest-order rectangular Raviart-Thomas element for Laplace eigenvalues exhibits supercloseness to interpolated solutions enabling one-order accuracy gains via post-processing, error expansions supporting Richardson extrapolation and above-convergence proofs, plus equivalence to enriched rotated