Journal of Symbolic Logic 72 (4):1372 - 1378 (2007)

Abstract
We isolate a forcing which increases the value of $\delta _{2}^{1}$ while preserving ω₁ under the assumption that there is a precipitous ideal on ω₁ and a measurable cardinal
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DOI 10.2178/jsl/1203350792
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Preservation Theorems for Namba Forcing.Osvaldo Guzmán, Michael Hrušák & Jindřich Zapletal - 2021 - Annals of Pure and Applied Logic 172 (2):102869.

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