Mathematics – Logic
Scientific paper
2005-05-23
Math. Log. Quart. 52, No. 2, 115 -- 124 (2006)
Mathematics
Logic
Scientific paper
10.1002/malq.200510018
We give a self-contained proof of the preservation theorem for proper
countable support iterations known as ``tools-preservation'', ``Case A'' or
``first preservation theorem'' in the literature. We do not assume that the
forcings add reals.
Goldstern Martin
Kellner Jakob
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