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Ultrafilter with $\aleph_0$ predecessors in Rudin-Frolík order
Commentationes Mathematicae Universitatis Carolinae, Tome 22 (1981) no. 3, pp. 429-447 Cet article a éte moissonné depuis la source Czech Digital Mathematics Library

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Classification : 03E05, 04A20, 54A25 
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Bukovský, Lev; Butkovičová, Eva. Ultrafilter with $\aleph_0$ predecessors in Rudin-Frolík order. Commentationes Mathematicae Universitatis Carolinae, Tome 22 (1981) no. 3, pp. 429-447. http://geodesic.mathdoc.fr/item/CMUC_1981_22_3_a0/

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