Abstract
We isolate a forcing which increases the value of δ12 while preserving ω₁ under the assumption that there is a precipitous ideal on ω₁ and a measurable cardinal.
Citation
Richard Ketchersid. Paul Larson. Jindřich Zapletal. "Increasing δ12 and Namba-style forcing." J. Symbolic Logic 72 (4) 1372 - 1378, December 2007. https://doi.org/10.2178/jsl/1203350792
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