Bifurcation Analysis of the Dynamics in COVID-19 Transmission through Living and Nonliving Media

Figure 4

Continuation of limit cycle formed at the Hopf point. (a) Continuation of the limit cycle in space: green curve denotes the codimension-one bifurcation diagram (equilibrium curve), blue curve denotes stable limit cycles generated as varies, and red curve denotes the unstable cycle generated at the two saddle-node bifurcations. (b) Continuation of the limit cycle in space. (c) Symmetric cycles constructed after the occurrence of branch point bifurcation of cycle: red cycle denotes an unstable cycle generated at the second saddle-node bifurcation of cycle.

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(b)

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