We prove that the braided Thompson's groups V-br and F-br are of type F-infinity, confirming a conjecture by John Meier. The proof involves showing that matching complexes of arcs on surfaces are highly connected. In an appendix, Zaremsky uses these connectivity results to exhibit families of subgroups of the pure braid group that are highly generating, in the sense of Abels and Holz.
机构:
Univ Ottawa, Dept Math & Stat, 585 King Edward, Ottawa, ON K1N 6N5, CanadaUniv Ottawa, Dept Math & Stat, 585 King Edward, Ottawa, ON K1N 6N5, Canada
Kaimanovich, Vadim A.
GROUPS, GRAPHS AND RANDOM WALKS,
2017,
436
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342