图

$u\left(x,y,0\right)$

图11和图12

$u=\cos \left(-\pi \left({\left(x-0.4\right)}^2+{\left(y+0.4\right)}^2\right)\right)+{\text{e}}^{-\sin \left({\left(x+0.4\right)}^2+{\left(y-0.4\right)}^2\right)}$

图13和图14

$u=\sin \left(\pi \left({\left(x-0.4\right)}^2+{\left(y+0.4\right)}^2\right)\right)-\sin \left({\text{e}}^{{\left(x+0.4\right)}^2+{\left(y-0.4\right)}^2}\right)$

图15和图16

$u=\text{sech}\left(\pi \left(-x^2+y^2\right)\right)$

图17和图18

$u=\sin \left(\pi \left(-x^2-y^2\right)\right)$

图19和图20

$u=12/25-\sin \left(10x^2-510\right)+\sin \left(\pi y-220\right)$

图21和图22

$u=12/25-\sin \left(\pi x^2-510\right)+\sin \left(\cos \left(x^2+y^2-22\right)\right)$