An example of a non-amenable dynamical system which is boundary amenable

preprint2022arXivOpen access

Abstract

It is shown that the action of SL(3,Z){\rm SL}(3,\mathbb{Z}) on the Stone-uCech boundary of SL(3,Z)/SL(2,Z){\rm SL}(3,\mathbb{Z}) / {\rm SL}(2,\mathbb{Z}) is amenable. This confirms a prediction by Bekka and Kalantar.

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