On invariant curves of quasi-periodic mappings without the twist condition
On invariant curves of quasi-periodic mappings without the twist condition
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DOI:
10.1360/scm-2020-0410
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发表时间:
2021-01
影响因子:
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通讯作者:
Yang Lianpeng;L. Xiong
中科院分区:
文献类型:
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作者:
Yang Lianpeng;L. Xiong
In this paper, we are concerned with the existence of invariant curves for mappings without the twist condition, which are quasi-periodic in one of the spatial variables with frequencies (cid:22) 1 ; (cid:22) 2 ; : : : ; (cid:22) m . It is proved that if (cid:22) 1 ; (cid:22) 2 ; : : : ; (cid:22) m ; 2 (cid:25)! (cid:0) 1 satisfy the Diophantine condition, where ! belongs to the frequency domain of the unperturbed mapping, then there exists at least one invariant curve with the rotation number ! .