Annales Henri Lebesgue 2019
DOI: 10.5802/ahl.16
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Fixed points in compactifications and combinatorial counterparts

Abstract: The Kechris-Pestov-Todorcevic correspondence connects extreme amenability of topological groups with Ramsey properties of classes of finite structures. The purpose of the present paper is to recast it as one of the instances of a more general construction, allowing to show that Ramsey-type statements actually appear as natural combinatorial expressions of the existence of fixed points in certain compactifications of groups, and that similar correspondences in fact exist in various dynamical contexts. Résumé.-L… Show more

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“…For example, this is the case for every locally compact noncompact G. On the other hand, many interesting massive Polish groups are extremely amenable that is, having trivial M (G). See for example [63,64,74,76]. The first example of a nontrivial yet metrizable M (G) was found by Pestov.…”
Section: Tame Minimal Systems and Topological Groupsmentioning
confidence: 99%
“…For example, this is the case for every locally compact noncompact G. On the other hand, many interesting massive Polish groups are extremely amenable that is, having trivial M (G). See for example [63,64,74,76]. The first example of a nontrivial yet metrizable M (G) was found by Pestov.…”
Section: Tame Minimal Systems and Topological Groupsmentioning
confidence: 99%