Figure 4From: Periodic pulse control of Hopf bifurcation in a fractional-order delay predator–prey model incorporating a prey refugePortrait of system (2.2) with initial values \((6.46,5.1)\) in Example 1. The delay is chosen as: \(\tau =5.1>\tau _{0}=4.9967\). This figure illustrates that system (2.2) exhibits a Hopf bifurcationBack to article page