The D'Alembert type waves and the soliton molecules in a (2+1)-dimensional Kadomtsev-Petviashvili with its hierarchy equation*

Hui-Ling Wu(吴慧伶),Sheng-Wan Fan(樊盛婉),Jin-Xi Fei(费金喜),Zheng-Yi Ma(马正义)

Figure 2. (a) The two-soliton molecule structure of the solution v from equations (17) and (31) at t = 0. (b) The three-soliton molecule structure of the solution v from equations (17) and (33) at t = 0. (c) The four-soliton molecule structure of the solution v from equations (17) and (35) at t = 0.