Conjecture on limit cycles for adjacent even cycle lengths

Let n4n\ge4 be even. Let ρ\rho and ϕ\phi be the game parameters, let π0\pi_0 and bn2b_{n-2} be the quantities defined for the stationary dynamics, and let Gn,n2G_{n,n-2}, En2E_{n-2}, En,n2E_{n,n-2}, Hn,n2H_{n,n-2}, and Gn+2,nG_{n+2,n} denote the functions whose zero curves partition the parameter plane. For a finite word ww, let Δw\Delta_w denote the corresponding set of initial states, and let [1,n,1,n2][1,n,1,n-2], [1,n2][1,n-2], and [1,n][1,n] denote the indicated limit cycles. Adjacent-cycle conjecture. Let n4n\ge4 be even. The curve bn2π0=0b_{n-2}-\pi_0=0 lies below Hn,n2=0H_{n,n-2}=0 and above Gn+2,n=0G_{n+2,n}=0, with bn2π0b_{n-2}-\pi_0 positive above and negative below the curve. If Gn,n2<0G_{n,n-2}<0 and En20E_{n-2}\ge0, there are precisely two limit cycles, of forms [1,n,1,n2][1,n,1,n-2] and [1,n2][1,n-2], together with an unstable equilibrium. If En2<0E_{n-2}<0 and En,n20E_{n,n-2}\ge0, there is a unique asymptotically stable limit cycle of form [1,n,1,n2][1,n,1,n-2], together with an unstable equilibrium. If En,n2<0E_{n,n-2}<0 and Hn,n20H_{n,n-2}\ge0, there are precisely two limit cycles, of forms [1,n,1,n2][1,n,1,n-2] and [1,n][1,n], together with an unstable equilibrium. If Hn,n2<0H_{n,n-2}<0 and bn2π00b_{n-2}-\pi_0\ge0, there is a unique asymptotically stable limit cycle of form [1,n][1,n], together with an unstable equilibrium. If bn2π0<0b_{n-2}-\pi_0<0 and Gn+2,n0G_{n+2,n}\ge0, there is a unique asymptotically stable limit cycle of form [1,n][1,n], together with an unstable equilibrium. In each case, the corresponding decomposition of ΔA\Delta_A in the conjecture is asserted, and every initial state in ΔBΔB\Delta_B-\Delta_{\overline{B}} eventually enters ΔA\Delta_A. These claims extend the proposed classification of greedy collective Parrondo dynamics beyond the regions covered by the preceding theorems; the supplied text presents them as conjectural rather than proved.

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Primary source

S. N. Ethier and Jiyeon Lee, “A discrete dynamical system for the greedy strategy at collective Parrondo games”, arXiv:1011.1773 (2011).

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