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Pattern closure of groups of tree automorphismsDOI: 10.1007/s13373-011-0007-2 Keywords: Closed self-similar groups,Finitely constrained groups,Patterns on trees,Compact groups,20E08,22C05,37B10 Abstract: It is shown that every group of automorphisms of a regular rooted tree that is defined by forbidding a set of patterns of size s + 1 is the topological closure of a self-similar, countable, regular branch group, branching over its level s stabilizer. As an application, it is shown that there are no infinite, finitely constrained, topologically finitely generated groups of binary tree automorphisms defined by forbidden patterns of size two.
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