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Traveling waves in diffusive predator-prey equations: Periodic orbits and point-to-periodic heteroclinic orbits. (English) Zbl 0617.92020
The reaction-diffusion system $$ U\sb t=\alpha U(\gamma -U)- UW/(1+U),\quad W\sb t=W\sb{xx}-W+\beta UW/(1+U) $$ is considered under some natural assumptions on the positive parameters occuring. This system has drawn much attention even without the diffusive term [see also e.g. {\it H. L. Smith}, SIAM J. Appl. Math. 42, 27-43 (1982; Zbl 0489.92019), and the reviewer, Nonlinear Anal., Theory Methods Appl. 8, 1295-1309 (1984; Zbl 0561.92015)]. Assuming the existence of a traveling wave solution the author gets a three-dimensional autonomous system of ordinary differential equations to be satisfied by this solution. Establishing the Hopf bifurcation in the latter system he shows the occurrence of a traveling wave train solution of the original system. He also shows the existence of a heteroclinic orbit joining an unstable equilibrium (absence of predators) to a positive equilibrium (in the pre- bifurcation situation) and to a periodic orbit (in the post-bifurcation situation).
Reviewer: M.Farkas

92D25Population dynamics (general)
35K57Reaction-diffusion equations
37G99Local and nonlocal bifurcation theory
34C05Location of integral curves, singular points, limit cycles (ODE)
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