Figure 3
(Color online) Second-order rational solutions: (a1) Three dimensional plot of \(u_{n}\) with \(e_{0}=0\) in (24); (b1) The trajectory plot of solution \(u_{n}\) by expressions (25) and (26) with \(e_{0}=0\) corresponding to (a1); (a2) Three dimensional plot of \(v_{n}\) with \(e_{0}=0\) in (24); (b2) The trajectory plot of solution \(v_{n}\) by expressions (25) and (26) with \(e_{0}=0\) corresponding to (a2)