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The action of a nilpotent group on its horofunction boundary has finite orbits

We study the action of a nilpotent group G with finite generating set S on its horofunction boundary. We show that there is one finite orbit associated to each facet of the polytope obtained by projecting S into the infinite component of the abelianisation of G. We also prove that these are the only finite orbits of Busemann points. To finish off, we examine in detail the Heisenberg group with its usual generators.

preprint2011arXivOpen access
Cormac Walsh
math.MGmath.GR
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Cormac Walsh

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