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

Figure 6

The limiting precess of 𝑢₃(𝜉) when 𝑐<0, (𝑎,𝑏)∈𝐴₆, and (𝑎,𝑏) tends to the line 𝑙₃, where 𝑎=−9 and 𝑐=−1.

(a) for 𝑏=−1.5875

(b) for 𝑏=−1.6865

(c) for 𝑏=−1.687499