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Stationary countable dense random sets

Published online by Cambridge University Press:  01 July 2016

Wilfrid S. Kendall*
Affiliation:
University of Warwick
*
Postal address: Department of Statistics, University of Warwick, Coventry CV4 7AL, UK. Email address: [email protected]

Abstract

We study the probability theory of countable dense random subsets of (uncountably infinite) Polish spaces. It is shown that if such a set is stationary with respect to a transitive (locally compact) group of symmetries then any event which concerns the random set itself (rather than accidental details of its construction) must have probability zero or one. Indeed the result requires only quasi-stationarity (null-events stay null under the group action). In passing, it is noted that the property of being countable does not correspond to a measurable subset of the space of subsets of an uncountably infinite Polish space.

Type
Stochastic Geometry and Statistical Applications
Copyright
Copyright © Applied Probability Trust 2000 

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