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We consider a conforming finite element approximation of the Reissner- Mindlin eigenvalue system, for which a robust  a posteriori  error estimator for the eigenvector and the eigenvalue errors is proposed. For that purpose, we first perform a robust  a priori  error analysis without strong regularity assumption. Upper and lower bounds are then obtained up to higher order terms that are superconvergent, provided that the eigenvalue is simple. The convergence rate of the proposed estimator is confirmed by a numerical test.

Robust residual a posteriori error estimators for the Reissner–Mindlin eigenvalues system