Abstract
Abstract Dynamical properties of limit cycles for a tropically discretized negative feedback model are numerically investigated. This model has a controlling parameter τ, which corresponds to the time interval for the time evolution of phase in the limit cycles. By considering τ as a bifurcation parameter, we find that an ultradiscrete state emerges due to phase lock caused by saddle-node bifurcation. Furthermore, focusing on limit cycles for the max-plus negative feedback model, it is found that the unstable limit cycle in the max-plus model corresponds to the unstable fixed points emerging by the saddle-node bifurcation in the tropically discretized model.
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