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arXiv · 2607.23215

An a Posteriori Error Estimator for $C^0$ IPG Approximation of Multiple and Clustered Eigenvalues of the Biharmonic Operator

Jianing Guo·Qigang Liang
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Abstract

In this paper, based on the $C^0$ interior penalty Galerkin ($C^0$IPG) discretization, we propose and analyze an a posteriori error estimator for eigenfunctions associated with multiple and clustered eigenvalues of the biharmonic operator. The proposed estimator may capture the local singularities of the target eigenfunctions efficiently and play an important role in adaptive procedures. We develop a rigorous cluster-projection-based analysis and introduce an auxiliary theoretical error estimator to connect the invariant subspace error with a computable residual estimator. Most importantly, the resulting reliability and efficiency bounds are robust with respect to the mesh size, the mesh level and the internal spectral gaps within the target cluster. Numerical experiments support the theoretical results and demonstrate the robustness of the proposed estimator.

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Jianing Guo, Qigang Liang. 2026-07-25. An a Posteriori Error Estimator for $C^0$ IPG Approximation of Multiple and Clustered Eigenvalues of the Biharmonic Operator. https://arxiv.org/abs/2607.23215

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