The depths of the centres and the attracting centres of a class of dendrite maps

The depths of the centres and the attracting centres of a class of dendrite maps
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一类树突图的中心深度和吸引中心

DOI:
10.1016/j.jmaa.2019.06.072
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发表时间:
2019-11
影响因子:
1.3
通讯作者:
B Qin
B Qin
中科院分区:
数学3区
文献类型:
--
作者:
T Sun;G Su;B Qin

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设D1是分支点的聚点数有限的枝晶集,D∈ D1,f是从D到D的连续映射.分别用R(f),Ω(f)和ω(x,f)表示f的回归点集,f的非游荡点集和x在f下的ω-极限点集。记ω(f)=<$x∈ D ω(x,f)和ω n+ 1(f)=<$x∈ ω n(f)ω(x,f)和Ω n+ 1(f)= Ω(f| Ω n(f))。本文证明了Ω 4(f)= R(f)<$,f的深度至多为4,ω 4(f)= ω 3(f).进一步证明了存在枝晶D1,D2 ∈ D1和f1 ∈ C 0(D1),f2 ∈ C 0(D2)使得Ω 3(f1)<$R(f1)<$且ω 3(f2)<$ω 2(f2).
Let D 1 be the set of dendrites with the number of the accumulation points of branch points being finite, D∈ D 1 and f be a continuous map from D to D. Denote by R (f), Ω (f) and ω (x, f) the set of recurrent points of f, the set of non-wandering points of f and the set of ω-limit points of x under f, respectively. Write ω (f)=∪ x∈ D ω (x, f) and ω n+ 1 (f)=∪ x∈ ω n (f) ω (x, f) and Ω n+ 1 (f)= Ω (f| Ω n (f)) for any n∈ N. In this paper, we show that Ω 4 (f)= R (f)‾ and the depth of f is at most 4, and ω 4 (f)= ω 3 (f). Furthermore, we show that there exist dendrites D 1, D 2∈ D 1 and f 1∈ C 0 (D 1) and f 2∈ C 0 (D 2) such that Ω 3 (f 1)≠ R (f 1)‾ and ω 3 (f 2)≠ ω 2 (f 2).
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