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数学证明
环空(植物学)
数学
点(几何)
纯数学
几何学
植物
生物
出处
期刊:Regular & Chaotic Dynamics
[Springer Nature]
日期:2023-04-10
卷期号:28 (4-5): 343-363
标识
DOI:10.1134/s1560354723510019
摘要
We introduce the notion of abstract angle at a couple of points defined by two radial foliations of the closed annulus. We use this notion to give unified proofs of some classical results on area preserving positive twist maps of the annulus by using the Lifting Theorem and the Intermediate Value Theorem.
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