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Fat P-sets in the Space ω*

Ryszard Frankiewicz, Magdalena Grzech, Paweł Zbierski (2005)

Bulletin of the Polish Academy of Sciences. Mathematics

We prove that-consistently-in the space ω* there are no P-sets with the ℂ-cc and any two fat P-sets with the ℂ⁺-cc are coabsolute.

Forcing with ideals generated by closed sets

Jindřich Zapletal (2002)

Commentationes Mathematicae Universitatis Carolinae

Consider the poset P I = Borel ( ) I where I is an arbitrary σ -ideal σ -generated by a projective collection of closed sets. Then the P I extension is given by a single real r of an almost minimal degree: every real s V [ r ] is Cohen-generic over V or V [ s ] = V [ r ] .

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