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Commentationes Mathematicae Universitatis Carolinae
Volume 23
Issue 4
Article
Butkovičová, Eva
Ultrafilters without immediate predecessors in Rudin-Frolík order
.
(English).
Commentationes Mathematicae Universitatis Carolinae
,
vol. 23 (1982), issue 4
,
pp. 757-766
MSC:
03E05
,
04A20
|
MR 687570
|
Zbl 0507.03020
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References:
[1] L. Bukovský E. Butkovičová:
Ultrafliter with $\kappa_0$ predecessors in Rudin-Frolík order
. Comment. Math. Univ. Carolinae 22 (1981), 429-447.
MR 0633575
[2] Z. Frolík:
Sums of ultrafilters
. Bull. Amer. Math. Soc. 73 (1967), 87-91.
MR 0203676
[3] K. Kunen:
Weak P-points in $N^*$
. preprint.
MR 0588822
|
Zbl 0435.54021
[4] M. E. Rudin:
Partial orders of the types in $\beta N$
. Trans. Amer. Math. Soc. 155 (1971), 353-362.
MR 0273581
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