Ultrafilters without immediate predecessors in Rudin-Frolík order
Eva Butkovičová (1982)
Commentationes Mathematicae Universitatis Carolinae
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Eva Butkovičová (1982)
Commentationes Mathematicae Universitatis Carolinae
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Ivan Korec (1984)
Commentationes Mathematicae Universitatis Carolinae
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Zdeněk Frolík (1967)
Commentationes Mathematicae Universitatis Carolinae
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