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Bounds for fixed points and fixed subgroupson surfaces and graphs

机译:固定点和固定子组曲面和图形的界线

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We consider selfmaps of hyperbolic surfaces and graphs, and give some bounds involving the rank and the index of fixed point classes. One consequence is a rank bound for fixed subgroups of surface group endomorphisms, similar to the Bestvina–Handel bound (originally known as the Scott conjecture) for free group automorphisms. When the selfmap is homotopic to a homeomorphism, we rely on Thurston's classification of surface automorphisms. When the surface has boundary, we work with its spine, and Bestvina–Handel's theory of train track maps on graphs plays an essential role. It turns out that the control of empty fixed point classes (for surface automorphisms) presents a special challenge. For this purpose, an alternative definition of fixed point class is introduced, which avoids covering spaces hence is more convenient for geometric discussions.
机译:我们考虑双曲曲面和图形的自映射,并给出一些涉及定点类的等级和索引的界限。结果就是表面群同形的固定子群的秩界,类似于自由群同形的Bestvina–Handel界(最初称为Scott猜想)。当自映射与同胚同构时,我们依靠Thurston对表面自同构的分类。当表面具有边界时,我们将使用它的脊线,而Bestvina–Handel在图形上的火车轨道图理论起着至关重要的作用。事实证明,空固定点类的控制(针对表面自同构)提出了一个特殊的挑战。为此,引入了定点类的替代定义,它避免了覆盖空间,因此更方便进行几何讨论。

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