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Media type:
E-Article
Title:
P Points With Countably Many Constellations
Contributor:
Rosen, Ned I.
imprint:
American Mathematical Society, 1985
Published in:Transactions of the American Mathematical Society
Language:
English
ISSN:
0002-9947
Origination:
Footnote:
Description:
<p>If the continuum hypothesis (CH) is true, then for any P point ultrafilter D (on the set of natural numbers) there exist initial segments of the Rudin-Keisler ordering, restricted to (isomorphism classes of) P points which lie above D, of order type ℵ<sub>1</sub>. In particular, if D is an RK-minimal ultrafilter, then we have (CH) that there exist P-points with countably many constellations.</p>