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

Research paper by Kathryn Mann

Indexed on: 14 Oct '14Published on: 14 Oct '14Published in: Mathematics - Dynamical Systems


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.