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Table 2 Results obtained for first derivative of the slit problem

From: A fourth order block-hexagonal grid approximation for the solution of Laplace’s equation with singularities

\(\boldsymbol{(h^{-1},n)}\) (16,70) (32,70) (64,110) (128,130)
\(\Vert \epsilon_{h}^{ ( 1 ) }\Vert _{\overline{D}_{S}}\) 7.89831 × 10−7 9.78871 × 10−8 4.29502 × 10−9 2.94108 × 10−10