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Fourth-order convergence conjecture for the two-grid finite difference method
Let $U_{ij}$ be the finite difference solution produced by the two-grid method for the elliptic interface problem … with a linear boundary condition (Dirichlet, Neumann, or Robin),…
Conjectureopenfinite-difference-methods interface-problems numerical-analysisarXiv posted 2 days ago

Fourth-order convergence conjecture for the two-grid finite difference method