Left-orderable groups that don't act on the line

Kathryn Mann

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arXiv · 1406.5575

Left-orderable groups that don't act on the line

Kathryn Mann

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Abstract

We show that the group of germs at infinity of orientation-preserving homeomorphisms of R admits no action on the line. This gives an example of a left-orderable group of the same cardinality as Homeo+(R) that does not embed in Homeo+(R). As an application of our techniques, we construct a finitely generated group of germs that does not extend to Homeo+(R) and, separately, extend a theorem of E. Militon on homomorphisms between groups of homeomorphisms.

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Kathryn Mann. 2014-06-21. Left-orderable groups that don't act on the line. https://arxiv.org/abs/1406.5575

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