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Table 3 Results obtained for second 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)
\(\Vert \epsilon_{h}^{ ( 2 ) }\Vert _{\overline{D}_{S}}\) 3.7119 × 10−6 9.736 × 10−7 2.03211 × 10−8 9.30597 × 10−10