The no-isolated-points conjecture for circular orders on free products

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Let GG and HH be circularly orderable groups, and let G∗HG*H denote their free product. Write CO⁡(G∗H)\operatorname{CO}(G*H) for the space of circular orders on G∗HG*H, with its natural topology. An isolated point is a circular order that is isolated in this topological space.

Free-product no-isolated-points conjecture. The space CO⁡(G∗H)\operatorname{CO}(G*H) either has no isolated points or is finite. In particular, if it is infinite, then CO⁡(G∗H)\operatorname{CO}(G*H) is a Cantor set.

This proposed generalization removes the infiniteness and minimality assumptions from the paper's theorem on non-isolated circular orders. The finite cyclic case illustrates why a finite alternative is necessary, and the general assertion remains open.

References

Primary source

Hyungryul Baik and Eric Samperton, “Spaces of invariant circular orders of groups”, arXiv:1508.02661 (2016).

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