CAT-GFEM adds a coarse-mesh residual correction to achieve higher-order L2 accuracy and prove convergence for nonselfadjoint and indefinite elliptic problems, improving on prior ATGFEM limited to symmetric positive-definite cases.
Verfürth.A posteriori error estimation techniques for finite element methods
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A correction adaptive two-grid finite element method for nonselfadjoint or indefinite elliptic problems
CAT-GFEM adds a coarse-mesh residual correction to achieve higher-order L2 accuracy and prove convergence for nonselfadjoint and indefinite elliptic problems, improving on prior ATGFEM limited to symmetric positive-definite cases.