arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2209.04720math.GT
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环面上具有两个穿孔的弧系

Systems of arcs on a torus with two punctures

Denali Relles

摘要:

对于具有有限集标记点集$ P $的紧致曲面$ S $,我们定义了一个1-系为两两非同伦且两两相交最多一次的弧的集合。证明了当$ S $为环面且$ |P| = 2 $为环面时,在等价条件下,$ (S, P) $上恰好有23个极大1-系.一路上,我们推广的一些结果,以前的文件的背景下,表面的边界。特别地,我们证明了$ (S, P) $上的1-系统的最大基数是$ 2 |χ| (|χ| + 1) - \frac{v}{2} $,其中$ χ$是$ (S, P) $的欧拉示性数线,$ v $是$ P $在$ S $边界上的标志点的个数.

英文摘要:

For a compact surface $ S $ with a finite set of marked points $ P $, we define a 1-system to be a collection of arcs which are pairwise non-homotopic and intersect pairwise at most once. We prove that, up to equivalence, there are exactly 23 maximal 1-systems on $ (S, P) $ when $ S $ is a torus and $ |P| = 2 $. Along the way, we generalize some of the results of a previous paper to the context of surfaces with boundary. In particular, we prove that the maximal cardinality of a 1-system on $ (S, P) $ is $ 2 |χ| (|χ| + 1) - \frac{v}{2} $, where $ χ$ is the Euler characteristic of $ (S, P) $ and $ v $ is the number of marked points of $ P $ in the boundary of $ S $.

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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