Song, Yongli; Wei, Junjie Local Hopf bifurcation and global periodic solutions in a delayed predator–prey system. (English) Zbl 1067.34076 J. Math. Anal. Appl. 301, No. 1, 1-21 (2005). The article considers a delayed predator-prey system of the form \[ \begin{aligned}\dot x(t)&=x(t)[r_1-a_{11}x(t-\tau)-a_{12}y(t)],\\ \dot y(t)&=y(t)[-r_2+a_{21}x(t)-a_{22}y(t)],\end{aligned} \] where all constants are positive. First, the authors discuss the existence of local Hopf bifurcations, deriving explicit formulas for the stability and direction of the branch of periodic solutions emerging from the Hopf bifurcation. This is achieved using normal form theory and center manifold theory. Next, the authors consider the global existence of periodic solutions bifurcating from the Hopf bifurcation. Using a result from J. Wu [Trans. Am. Math. Soc. 350, No. 12, 4799–4838 (1998; Zbl 0905.34034)], they prove that, for delays greater than a critical value, there always exist periodic solutions. Finally, several numerical simulations supporting the theoretical analysis are given. Reviewer: Jan Sieber (Bristol) Cited in 1 ReviewCited in 135 Documents MSC: 34K18 Bifurcation theory of functional-differential equations 34K13 Periodic solutions to functional-differential equations Keywords:time delay; Hopf bifurcation; global Hopf bifurcation; periodic solutions Citations:Zbl 0905.34034 × Cite Format Result Cite Review PDF Full Text: DOI References: [1] Baptistiini, M. Z.; Táboas, P., On the existence and global bifurcation of periodic solutions to planar differential delay equations, J. Differential Equations, 127, 391-425 (1996) · Zbl 0849.34053 [2] Chow, S. N.; Hale, J. K., Periodic solutions of autonomous equations, J. Math. Anal. Appl., 66, 495-506 (1978) · Zbl 0397.34091 [3] Cooke, K.; Grossman, Z., Discrete delay, distributed delay and stability switches, J. Math. Anal. Appl., 86, 592-627 (1982) · Zbl 0492.34064 [4] Erbe, L. 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