Today's discussion will be dedicated to the coarse geometry of the mapping class groups of the planar surfaces with spaces of ends that are countable.



Reference:


[MR20]     Kathryn Mann and Kasra Rafi. Large scale geometry of big mapping class groups. arxiv, 2020.
Ordinal spaces, Cantor-Bendixson derivative, Mazurkiewicz and Sierpiński theorem, Coarse geometry
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