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arXiv 0906.1601math.GT
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Dehn twists的根

Roots of Dehn twists

Darryl McCullough, Kashyap Rajeevsarathy

摘要:

D. Margalit和S.施莱默发现的例子根的德恩扭曲约一个非分离曲线在一个封闭的可定向曲面,也就是说,同胚的n权力是同位素的德恩扭曲。我们的主要定理给出了初等数论条件,这些条件描述了存在n根的n的值,给出了曲面的亏格。在它的应用中,我们证明了n必须是奇数,Margalit-Schleimer根在给定属的根中达到n的最大值,并且对于给定的奇数n,对于所有属都存在n个根,大于(n-2)(n-1)/2。我们还描述了所有n大于或等于亏格的n次方根。

英文摘要:

D. Margalit and S. Schleimer found examples of roots of the Dehn twist about a nonseparating curve in a closed orientable surface, that is, homeomorphisms whose nth power is isotopic to the Dehn twist. Our main theorem gives elementary number-theoretic conditions that describe the values of n for which an nth root exists, given the genus of the surface. Among its applications, we show that n must be odd, that the Margalit-Schleimer roots achieve the maximum value of n among the roots for a given genus, and that for a given odd n, nth roots exist for all genera greater than (n-2)(n-1)/2. We also describe all nth roots having n greater than or equal to the genus.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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