Countable support iterations and large continuum

Details Countable support iterations and large continuum Countable support iterations and large continuum

1997-02-17

arxiv.org/abs/math/9702204v1

Mathematics

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Scientific paper

We prove that any countable support iteration formed with posets with $\omega_2$-p.i.c.\ has $\omega_2$-c.c., assuming CH in the ground model and assuming also that $\omega_1$ is not collapsed. This improves earlier results of Shelah by removing the restriction on the length of the iteration. Thus, we solve the problem of obtaining a large continuum via such forcing iterations.

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