New Exact Solitary Wave Solutions of a Coupled Nonlinear Wave Equation

Figure 2

The phase portraits of system (9) for𝑏₃<0.

(a)  𝑞<0,Δ=0

(b) 𝑞<0,Δ<0

(c) 𝑞=0,Δ<0

(d) 𝑞>0,Δ=0

(e) 𝑞>0,Δ<0