Geodesic
Ultrafilters without immediate predecessors in Rudin-Frolík order
Commentationes Mathematicae Universitatis Carolinae, Tome 23 (1982) no. 4, pp. 757-766
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Classification : 03E05, 04A20 
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Butkovičová, Eva. Ultrafilters without immediate predecessors in Rudin-Frolík order. Commentationes Mathematicae Universitatis Carolinae, Tome 23 (1982) no. 4, pp. 757-766. http://geodesic.mathdoc.fr/item/CMUC_1982_23_4_a12/

[1] L. Bukovský E. Butkovičová: Ultrafliter with $\kappa_0$ predecessors in Rudin-Frolík order. Comment. Math. Univ. Carolinae 22 (1981), 429-447. | MR

[2] Z. Frolík: Sums of ultrafilters. Bull. Amer. Math. Soc. 73 (1967), 87-91. | MR

[3] K. Kunen: Weak P-points in $N^*$. preprint. | MR | Zbl

[4] M. E. Rudin: Partial orders of the types in $\beta N$. Trans. Amer. Math. Soc. 155 (1971), 353-362. | MR