Ordinal ultrafilters versus P-hierarchy

Published 10 Jan 2012 in math.LO | (1201.2148v2)

Abstract: An earlier paper, entitled "P-hierarchy on $\beta\omega$", investigated the relations between ordinal ultrafilters and the so-called P-hierarchy. This study is continued in the present paper and focuses on the aspects of characterization of classes of finite index, existence, generic existence and the Rudin-Keisler-order.

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Andrzej Starosolski

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