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Donder's Version of Revised Countable Support

Ulrich Fuchs
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Abstract

Shelah introduced the revised countable support (RCS) iteration to iterate semiproperness. This was an endpoint in the search for an iteration of a weak condition, still implying that aleph1 is preserved. Dieter Donder found a better manageable approach to this iteration, which is presented here.

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Ulrich Fuchs. 1992-07-30. Donder's Version of Revised Countable Support. https://arxiv.org/abs/math/9207204

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