In recent years,the study of Hopf bifurcation problems has been one of important subjects in dynamical systems and has been applied extensively in many fields such as Mechanics,Physics,Chemistry,Biology,Ecology,Control,Numerical calculations,Engineering technology and Economics and Social sciences and so on.The predator-prey system is the fundamental structure in the population dynamics and studying these systems is important to understand the real world. Based on those facts,we consider stability and Hopf bifurcation of two kinds of predator-prey systems with multiple delays.
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