Trigonometric Function Periodic Wave Solutions and Their Limit Forms for the KdV-Like and the PC-Like Equations

Figure 1

The locations of the lines 𝑙_𝑖, 𝑘_𝑖(𝑖=1,2,3,4) and the regions 𝐴_𝑗, 𝐵_𝑗(𝑗=1,2,…,8) for given constant 𝑐≠0.

(a) 𝑐<0

(b) 𝑐>0