Figure 5From: A fourth order block-hexagonal grid approximation for the solution of Laplace’s equation with singularities \(\pmb{\frac{\partial^{2}U_{h}}{\partial x^{2}}}\) in ‘singular’ part \(\pmb{P_{S}^{1}}\) shown by (a) and in \(\pmb{P_{S}^{2}}\) shown by (b). Back to article page