The space of bi-invariant orders on a nilpotent group

Details The space of bi-invariant orders on a nilpotent group The space of bi-invariant orders on a nilpotent group

2012-04-02

arxiv.org/abs/1204.0454v2

New York Journal of Mathematics 18 (2012) 261-273

Mathematics

Group Theory

13 pages, no figures. Final version that appeared in New York Journal of Mathematics

Scientific paper

We prove a few basic facts about the space of bi-invariant (or left-invariant) total order relations on a torsion-free, nonabelian, nilpotent group G. For instance, we show that the space of bi-invariant orders has no isolated points (so it is a Cantor set if G is countable), and give examples to show that the outer automorphism group of G does not always act faithfully on this space. Also, it is not difficult to see that the abstract commensurator group of G has a natural action on the space of left-invariant orders, and we show that this action is faithful. These results are related to recent work of T.Koberda that shows the automorphism group of G acts faithfully on this space.

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