A few special ordinal ultrafilters
classification
🧮 math.LO
keywords
notionordinalbaumgartnercomplexityfamiliarindependentintroducedordering
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We prove various results on the notion of ordinal ultrafiters introduced by J. Baumgartner. In particular, we show that this notion of ultrafilter complexity is independent of the more familiar Rudin-Keisler ordering.
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