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arXiv 2110.03087math.GTmath.GR
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大映射类群的渐近维数

Asymptotic Dimension of Big Mapping Class Groups

Curtis Grant, Kasra Rafi, Yvon Verberne

摘要:

即使大的映射类群不是可数生成的,某些大的映射类群也可以由一个粗略的有界集生成,并且具有一个定义良好的拟等距类型。证明了具有粗有界生成集且包含本质移位的无穷型稳定曲面的大映射类群具有无穷渐近维数。这与其中渐近维数总是有限的有限型曲面的映射类群相反。我们还给出了本质位移的拓扑刻画。

英文摘要:

Even though big mapping class groups are not countably generated, certain big mapping class groups can be generated by a coarsely bounded set and have a well defined quasi-isometry type. We show that the big mapping class group of a stable surface of infinite type with a coarsely bounded generating set that contains an essential shift has infinite asymptotic dimension. This is in contrast with the mapping class groups of surfaces of finite type where the asymptotic dimension is always finite. We also give a topological characterization of essential shifts.

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