The lamplighter group of rank two generated by a bireversible automaton
classification
🧮 math.GR
keywords
mathbbautomatonbireversiblegrouplamplighterrankactionaffine
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We construct a 4-state 2-letter bireversible automaton generating the lamplighter group $(\mathbb Z_2^2)\wr\mathbb Z$ of rank two. The action of the generators on the boundary of the tree can be induced by the affine transformations on the ring $\mathbb Z_2[[t]]$ of formal power series over $\mathbb Z_2$.
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