Results for ' ultrafilters of character $\omega_1$'

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    Ultrafilters of Character $omega_1$.Klaas Pieter Hart - 1989 - Journal of Symbolic Logic 54 (1):1-15.
    Using side-by-side Sacks forcing, it is shown that it is consistent that $2^\omega$ be large and that there be many types of ultrafilters of character $\omega_1$.
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