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The conforming bilinear mixed finite element method is established for a fourth‐order wave equation. By applying the interpolation and projection simultaneously, the superclose and superconvergence results of order O(h2) for the original variable u and intermediate variable p =− a1(X)Δu in H1‐norm are achieved for the semi‐discrete and fully discrete schemes, respectively (where a1(X) is the coefficient...
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