Ramification systems and spaces of ultrafilters

Negrepontis, S.

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Combinatorial properties of uniformities

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On the existence of true uniform ultrafilters

Petr Simon (2004)

Commentationes Mathematicae Universitatis Carolinae

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We shall show that there is an ultrafilter on singular $κ$ with countable cofinality, which cannot be reached from the set of all subuniform ultrafilters by iterating the closure of sets of size $< κ$ .