Abstract
Let (G n , X n ) be a sequence of finite transitive permutation groups with uniformly bounded number of generators. We prove that the infinitely iterated permutational wreath product \({\ldots\wr G_2\wr G_1}\) is topologically finitely generated if and only if the profinite abelian group \({\prod_{n\geq 1} G_n/G'_n}\) is topologically finitely generated. As a corollary, for a finite transitive group G the minimal number of generators of the wreath power \({G\wr \ldots\wr G\wr G}\) (n times) is bounded if G is perfect, and grows linearly if G is non-perfect. As a by-product we construct a finitely generated branch group, which has maximal subgroups of infinite index.
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Bondarenko, I.V. Finite generation of iterated wreath products. Arch. Math. 95, 301–308 (2010). https://doi.org/10.1007/s00013-010-0169-2
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DOI: https://doi.org/10.1007/s00013-010-0169-2