p-points in iterated forcing extensions
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1978-05-03Article Version
Scholarly/refereed, publisher version
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Selective ultrafilters exist in direct iterated ccc extensions whose length has uncountable cofinality, as do p-points which are not selective. Nonselective p-points also exist e.g. in an iterated Laver or Mathias extension of length w2 over a model of CH.
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This is the published version, also available here: http://dx.doi.org/10.1090/S0002-9939-1978-0469759-X. First published in Proc. Amer. Math. Soc. in 1978, published by the American Mathematical Society.
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Roitman, Judith A. "p-points in iterated forcing extensions." Proc. Amer. Math. Soc. 69 (1978), 314-318. http://dx.doi.org/10.1090/S0002-9939-1978-0469759-X.
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