Abstract
Let (T, d) be a dendrite with finite branch points and f be a continuous map from T to T. Denote by ω(x, f) and P(f) the ω-limit set of x under f and the set of periodic points of f, respectively. Write Ω(x, f) = {y| there exist a sequence of points x k ∈ T and a sequence of positive integers n 1 < n 2 < ··· such that lim k→∞ x k = x and lim k→∞ \(f^{n_{k}}\) (x k ) = y}. In this paper, we show that the following statements are equivalent: (1) f is equicontinuous. (2) ω(x, f) = Ω(x, f) for any x ∈ T. (3) ∩ ∞ n=1 f n(T) = P(f), and ω(x, f) is a periodic orbit for every x ∈ T and map h: x → ω(x, f) (x ∈ T) is continuous. (4) Ω(x, f) is a periodic orbit for any x ∈ T.
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We thank the referees for their careful reading of the manuscript and constructive comments and suggestions.
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Supported by NNSF of China (Grant No. 11461003) and SF of Guangxi Univresity of Finance and Economics (Grant Nos. 2016KY15, 2016ZDKT06 and 2016TJYB06)
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Sun, T.X., Su, G.W., Xi, H.J. et al. Equicontinuity of maps on a dendrite with finite branch points. Acta. Math. Sin.-English Ser. 33, 1125–1130 (2017). https://doi.org/10.1007/s10114-017-6289-x
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DOI: https://doi.org/10.1007/s10114-017-6289-x