Abstract
An important part of many independence proofs using iterated forcing, is to show that some property X is preserved (if satisfied by each iterand). We have dealt with such a problem (the ω ω-bounding property) and similar proofs can be worked out for several other examples. We give here a general context which serves for many examples (but unfortunately not for “adding no reals”). In fact there is more in common between the examples discussed later even than expressed by the stricter context suggested here (fine covering model) (i.e., the use of trees T, T ∩ n ω finite )but the saving will be minimal.
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© 1982 Springer-Verlag Berlin Heidelberg
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Shelah, S. (1982). P-Points and Preservation Theorems. In: Proper Forcing. Lecture Notes in Mathematics, vol 940. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-21543-2_6
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DOI: https://doi.org/10.1007/978-3-662-21543-2_6
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-540-11593-9
Online ISBN: 978-3-662-21543-2
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