A more general iterable condition ensuring aleph_1 is not collapsed

Details A more general iterable condition ensuring aleph_1 is not collapsed A more general iterable condition ensuring aleph_1 is not collapsed

2004-04-11

arxiv.org/abs/math/0404221v1

Mathematics

Logic

Scientific paper

In a self-contained way, we deal with revised countable support iterated forcing for the reals. We improve theorems on preservation of the property UP, weaker than semi proper, and we hopefully improve the presentation. We continue [Sh:b, Ch.X,XI] (or see [Sh:f, Ch.X,XI]), and Gitik and Shelah [GiSh:191] and [Sh:f, Ch.XIII,XIV] and particularly Ch.XV. Concerning ``no new reals'' see lately Larson and Shelah [LrSh:746] math.LO/0011187. In particular, we fulfill some promises from [Sh:f] and give a more streamlined version.

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