Figure 4From: Accurate and efficient numerical solutions for elliptic obstacle problems The true solution to the linear problem for the obstacle \(\pmb{\varphi _{2}}\) ( 5.4 ) at resolution \(\pmb{64\times64}\) . (a) The obstacle \(\varphi _{2}\) and (b) the true solution \(u^{*}\) (5.6)Back to article page