On the topological full group of a minimal Cantor Z²-system
classification
🧮 math.DS
math.GR
keywords
cantorgroupminimalfulltopologicalamenableactionactions
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Grigorchuk and Medynets recently announced that the topological full group of a minimal Cantor Z-action is amenable. They asked whether the statement holds for all minimal Cantor actions of general amenable groups as well. We answer in the negative by producing a minimal Cantor Z^2-action for which the topological full group contains a non-abelian free group.
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