On the geometry of a class of invariant measures and a problem of Aldous

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dc.creatorAustin, Tim
dc.date2008-08-16
dc.date.accessioned2026-07-07T09:57:03Z
dc.date.available2026-07-07T09:57:03Z
dc.descriptionIn his 1985 survey of notions of exchangeability, Aldous introduced a form of exchangeability corresponding to the symmetries of the infinite discrete cube, and asked whether these exchangeable probability measures enjoy a representation theorem similar to those for exchangeable sequences, arrays and set-indexed families. In this note we to prove that, whereas the known representation theorems for different classes of partially exchangeable probability measure imply that the compact convex set of such measures is a Bauer simplex (that is, its subset of extreme points is closed), in the case of cube-exchangeability it is a copy of the Poulsen simplex (in which the extreme points are dense). This follows from the arguments used by Glasner and Weiss' for their characterization of property (T) in terms of the geometry of the simplex of invariant measures for associated generalized Bernoulli actions. The emergence of this Poulsen simplex suggests that, if a representation theorem for these processes is available at all, it must take a very different form from the case of set-indexed exchangeable families.
dc.description20 pages
dc.identifierhttps://arxiv.org/abs/0808.2268
dc.identifierhttp://arxiv.org/abs/0808.2268
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/167203
dc.subjectProbability
dc.subjectCombinatorics
dc.subject60G09; 37A15
dc.titleOn the geometry of a class of invariant measures and a problem of Aldous
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