Figure 1

The solution \(F_{1}(t,x,y)\) of (1) with \(k_{1}=1,k_{2}=1,l_{1}=1,l_{2}=1,\Omega _{1}=1,\Omega _{2}=1,\Omega _{3}=-1,\Omega _{4}=1,w=\frac{7}{2},v=-2\).

The solution \(F_{1}(t,x,y)\) of (1) with \(k_{1}=1,k_{2}=1,l_{1}=1,l_{2}=1,\Omega _{1}=1,\Omega _{2}=1,\Omega _{3}=-1,\Omega _{4}=1,w=\frac{7}{2},v=-2\).