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arxiv: 1501.06682 · v2 · pith:W3IYHORInew · submitted 2015-01-27 · 🧮 math.GR · math.GT

The Sigma-invariants of Thompson's group F via Morse theory

classification 🧮 math.GR math.GT
keywords groupsigmathompsonactsbieribnsr-invariantscomplexcomputed
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Bieri, Geoghegan and Kochloukova computed the BNSR-invariants $\Sigma^m(F)$ of Thompson's group $F$ for all $m$. We recompute these using entirely geometric techniques, making use of the Stein--Farley CAT(0) cube complex on which $F$ acts.

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