A higher-order accurate Petrov-Galerkin
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MacKinnon, R. J. ;Johnson, R. W. ;Langerman, M. A.
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Article
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1992
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Wiley (John Wiley & Sons)
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English
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We formulate a higher-order (superconvergent) Petrov-Galerkin method by determining, using a finitedifference approximation, the optimal selection of quadratic and cubic modifications to the standard linear test function for bilinear elements. Application of this method to linear elliptic problems r