Thin ultrafilters, P-hierarchu and MArtin Axiom

Details Thin ultrafilters, P-hierarchu and MArtin Axiom Thin ultrafilters, P-hierarchu and MArtin Axiom

2012-01-09

arxiv.org/abs/1201.1725v1

Mathematics

Logic

12 pages. arXiv admin note: substantial text overlap with arXiv:1108.1818

Scientific paper

Under MA we prove that for the ideal $\cal I$ of thin sets on $\omega$ and for any ordinal $\gamma \leq \omega_1$ there is an ${\cal I}$-ultrafilter (in the sense of Baumgartner), which belongs to the class ${\cal P}_{\gamma}$ of P-hierarchy of ultrafilters. Since the class of ${\cal P}_2$ ultrafilters coincides with a class of P-points, out result generalize theorem of Fla\v{s}kov\'a, which states that there are ${\cal I}$-ultrafilters which are not P-points. It is also related to theorem which states that under CH for any tall P-ideal $\cal I$ on $\omega$ there is an ${\cal I}$-ultrafilter, however the ideal of thin sets is not P-ideal.

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