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.
A weak Galerkin mixed finite eleme nt method for second order elliptic problems
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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.