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arxiv: 1508.06533 · v2 · pith:T63726HUnew · submitted 2015-08-26 · 🧮 math.LO

Infinite dimensional Ellentuck spaces and Ramsey-classification theorems

classification 🧮 math.LO
keywords mathcalspacesbarriersellentuckhierarchyinfiniteramsey-classificationstructures
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We extend the hierarchy of finite-dimensional Ellentuck spaces to infinite dimensions. Using uniform barriers $B$ on $\omega$ as the prototype structures, we construct a class of continuum many topological Ramsey spaces $\mathcal{E}_B$ which are Ellentuck-like in nature, and form a linearly ordered hierarchy under projection. We prove new Ramsey-classification theorems for equivalence relations on fronts, and hence also on barriers, on the spaces $\mathcal{E}_B$, extending the Pudlak-Rodl Theorem for barriers on the Ellentuck space. The inspiration for these spaces comes from continuing the iterative construction of the forcings $\mathcal{P}([\om]^k)/\Fin^{\otimes k}$ to the countable transfinite. The $\sigma$-closed partial order $(\mathcal{E}_B, \sse^{\Fin^{B}})$ is forcing equivalent to $\mathcal{P}(B)/\Fin^{B}$, which forces a non-p-point ultrafilter $\mathcal{G}_B$. The present work forms the basis for further work classifying the Rudin-Keisler and Tukey structures for the hierarchy of the generic ultrafilters $\mathcal{G}_B$.

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