Minimal hyperspace actions of homeomorphism groups of h-homogeneous spaces

Details Minimal hyperspace actions of homeomorphism groups of h-homogeneous spaces Minimal hyperspace actions of homeomorphism groups of h-homogeneous spaces

2011-07-07

arxiv.org/abs/1107.1436v2

Mathematics

Dynamical Systems

Scientific paper

Let X be a h-homogeneous zero-dimensional compact Hausdorff space, i.e. X is a Stone dual of a homogeneous Boolean algebra. Using the dual Ramsey theorem and a detailed combinatorial analysis of what we call stable collections of subsets of a finite set, we obtain a complete list of the minimal sub-systems of the compact dynamical system (Exp(Exp(X)),Homeo(X)), where Exp(X) stands for the hyperspace comprising the closed subsets of X equipped with the Vietoris topology. The importance of this dynamical system stems from Uspenskij's characterization of the universal ambit of G = Homeo(X). The results apply to X = C the Cantor set, the generalized Cantor sets X = {0,1}^kappa for non-countable cardinals kappa, and to several other spaces. A particular interesting case is X = beta(omega) \ omega, where beta(omega) denotes the Stone-Cech compactification of the natural numbers. This space, called the corona or the remainder of omega, has been extensively studied in the fields of set theory and topology.

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