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Validation of the Quality of the A Posteriori Error Estimator Based on Polynomial Preserving Recovery for Linear Elements

In this paper the quality of the error estimator based on the Polynomial Preserving Recovery (PPR) is investigated using the computer-based approach described in [1, 3]. Also, a comparison is made between the performance of the error estimator based on the PPR and the one based on the Superconvergence Patch Recovery (SPR).