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Two spaces homeomorphic to S e q ( p )

Jerry E. Vaughan (2001)

Commentationes Mathematicae Universitatis Carolinae

We consider the spaces called S e q ( u t ) , constructed on the set S e q of all finite sequences of natural numbers using ultrafilters u t to define the topology. For such spaces, we discuss continuity, homogeneity, and rigidity. We prove that S ( u t ) is homogeneous if and only if all the ultrafilters u t have the same Rudin-Keisler type. We proved that a space of Louveau, and in certain cases, a space of Sirota, are homeomorphic to S e q ( p ) (i.e., u t = p for all t S e q ). It follows that for a Ramsey ultrafilter p , S e q ( p ) is a topological group....

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