The classical residual-based a posteriori error estimator is proven to be both reliable and efficient for the discretization error in polygonal FEM based on Wachspress coordinates.
Polynomial-degree -robust a posteriori estimates in a unified setting for conforming, nonconforming, discont inuous Galerkin, and mixed discretizations
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An Adaptive Finite Element Method Based on Generalized Barycentric Coordinates
The classical residual-based a posteriori error estimator is proven to be both reliable and efficient for the discretization error in polygonal FEM based on Wachspress coordinates.