Journal of Symbolic Logic

Increasing δ12 and Namba-style forcing

Richard Ketchersid, Paul Larson, and Jindřich Zapletal

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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.

Article information

J. Symbolic Logic Volume 72, Issue 4 (2007), 1372-1378.

First available in Project Euclid: 18 February 2008

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Mathematical Reviews number (MathSciNet)

Zentralblatt MATH identifier

Primary: 03E40: Other aspects of forcing and Boolean-valued models


Ketchersid, Richard; Larson, Paul; Zapletal, Jindřich. Increasing δ 1 2 and Namba-style forcing. J. Symbolic Logic 72 (2007), no. 4, 1372--1378. doi:10.2178/jsl/1203350792.

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