The no-isolated-points conjecture for circular orders on free products
The no-isolated-points conjecture for circular orders on free products
Let and be circularly orderable groups, and let denote their free product. Write for the space of circular orders on , 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 either has no isolated points or is finite. In particular, if it is infinite, then 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.
Sources & referencesView supporting material
Primary source
Hyungryul Baik and Eric Samperton, “Spaces of invariant circular orders of groups”, arXiv:1508.02661 (2016).
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