Figure 1

Phase-parameter portrait of system (2) given as a cut of the positive parameter space (γ, β, δ) for an arbitrary fixed value of 0 <γ < 1 (a) and 1 <γ (b). The boundaries of domains are α₁ = {(δ, β, γ): δ - β = 0},α₂ = {(δ, β, γ): γ -δ = 0}, α₃ = {(δ, β, γ): γ β -δ = 0}, and α₄ = {(δ, β, γ): γ - δ - 1 + β = 0}.