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arxiv: 1412.7715 · v2 · pith:R4Z5FBTGnew · submitted 2014-12-24 · 🧮 math.GR

Quasi-automorphisms of the infinite rooted 2-edge-coloured binary tree

classification 🧮 math.GR
keywords groupstildebinarycalculateedgeinfinitetreebieri--neumann--strebel--renz
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We study the group $QV$, the self-maps of the infinite $2$-edge coloured binary tree which preserve the edge and colour relations at cofinitely many locations. We introduce related groups $QF$, $QT$, $\tilde{Q}T$, and $\tilde{Q}V$, prove that $QF$, $\tilde{Q}T$, and $\tilde{Q}V$ are of type $\mathrm{F}_\infty$, and calculate finite presentations for them. We calculate the normal subgroup structure and rational homology of all $5$ groups, the Bieri--Neumann--Strebel--Renz invariants of $QF$, and discuss the relationship of all $5$ groups with other generalisations of Thompson's groups.

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