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 1. (a) Kink molecule expressed by equations (12) and (13); (b) Kink-HPK molecule given by equations (12) and (14); (c) HPK-HPK molecule described by equations (12) and (15); (d) HPK-PK molecule defined by equations (12) and (16) at time t = 0.