Forcing and stable ordered-union ultrafilters

Journal of Symbolic Logic 67 (1):449-464 (2002)
We investigate the effect of a variant of Matet forcing on ultrafilters in the ground model and give a characterization of those P-points that survive such forcing, answering a question left open by Blass [4]. We investigate the question of when this variant of Matet forcing can be used to diagonalize small filters without destroying P-points in the ground model. We also deal with the question of generic existence of stable ordered-union ultrafilters
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DOI 10.2178/jsl/1190150054
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Andreas Blass (1990). Groupwise Density and Related Cardinals. Archive for Mathematical Logic 30 (1):1-11.

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