2025/06/19 by Jiangqiong Yu, Yu, Jiangqiong, Jiyu Zhong +5
Mathematics · Medicine · Physics and Astronomy · #37G10 #39A28 #58K50 #68W30 #Advanced Differential Equations and Dynamical Systems #Chaos control and synchronization #Dynamical Systems (math.DS) #FOS: Mathematics #Mathematical and Theoretical Epidemiology and Ecology Models
paper · pdf · doi:10.48550/arxiv.2506.15982
openalex publication_date 2025/06/19 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
In this paper, we mainly study the dynamic properties of a class of three-dimensional SIR models. Firstly, we use the \it complete discriminant theory of polynomials to obtain the parameter conditions for the topological types of each fixed point. Secondly, by employing the center manifold theorem and bifurcation theory, we prove that the system can undergo codimension 1 bifurcations, including transcritical, flip and Neimark-Sacker bifurcations, and codimension 2 bifurcations which contain Chenciner bifurcation, 1:3 and 1:4 strong resonances. Besides, by the theory of normal form, we give theoretically the Arnold tongues in the weak resonances such that the system possesses two periodic orbits on the stable invariant closed curve generated from the Neimark-Sacker bifurcation. Finally, in order to verify the theoretical results, we detect all codimension 1 and 2 bifurcations by using MatcontM and numerically simulate all bifurcation phenomena and the Arnold tongues in the weak resonances.