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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....

Ordinal remainders of classical ψ-spaces

Alan DowJerry E. Vaughan — 2012

Fundamenta Mathematicae

Let ω denote the set of natural numbers. We prove: for every mod-finite ascending chain T α : α < λ of infinite subsets of ω, there exists [ ω ] ω , an infinite maximal almost disjoint family (MADF) of infinite subsets of the natural numbers, such that the Stone-Čech remainder βψ∖ψ of the associated ψ-space, ψ = ψ(ω,ℳ ), is homeomorphic to λ + 1 with the order topology. We also prove that for every λ < ⁺, where is the tower number, there exists a mod-finite ascending chain T α : α < λ , hence a ψ-space with Stone-Čech remainder...

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