The extremely amenable subgroup conjecture for closed oligomorphic permutation groups

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Let GG be a closed oligomorphic permutation group, meaning a closed permutation group with finitely many orbits on nn-tuples for every n≥1n\geq 1. An expansion of an ω\omega-categorical structure is ordered when it includes a linear order, and is Ramsey when its age has the Ramsey property. The extremely amenable subgroup conjecture. Every closed oligomorphic permutation group contains a closed oligomorphic subgroup that is extremely amenable. Equivalently, every ω\omega-categorical structure has an ordered ω\omega-categorical expansion that is Ramsey. This is presented as an important variant of the unresolved conjecture discussed immediately beforehand, reformulated in terms of topological groups; no resolution is supplied in the source.

References

Primary source

Manuel Bodirsky, “Complexity Classification in Infinite-Domain Constraint Satisfaction”, arXiv:1201.0856 (2019).

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