| The general inverse inequalities are established. On the anisotropic triangulations, the application of the interpolation merits of bilinear element, quais-Wilson element and the modified five-nodes element to the second order elliptic problem, such as the orthogonality of the conforming part and the non-conforming part of the two nonconforming elements, contributes to the superconvergence and superclose properities of them. Numerical experiments are given to verify the theoretical analysis on anisotropic meshes.
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