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Finite-rank Bratteli-Vershik diagrams are expansive—a new proof

Siri-Malén Høynes

Abstract


Downarowicz and Maass (Ergod. Th. and Dynam. Sys. 28 (2008), 739–747) proved that the Cantor minimal system associated to a properly ordered Bratteli diagram of finite rank is either an odometer system or an expansive system. We give a new proof of this truly remarkable result which we think is more transparent and easier to understand. We also address the question (Question 1) raised by Downarowicz and Maass and we find a better (i.e. lower) bound. In fact, we conjecture that the bound we have found is optimal.


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References


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DOI: http://dx.doi.org/10.7146/math.scand.a-25613

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ISSN 0025-5521 (print) ISSN 1903-1807 (online)

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