Figure 9From: Accurate and efficient numerical solutions for elliptic obstacle problems The difference between the linear solution and the nonlinear solution, at the \(\pmb{64\times64}\) resolution, for the obstacle problem with \(\pmb{\varphi =\varphi _{1}}\) . (a) \((u_{h,\text{linear}}-u_{h,\text{nonlinear}})\) and (b) its density plot.Back to article page