Geodesic
On Namba Forcing And Minimal Collapses
Forum of Mathematics, Sigma, Tome 13 (2025) no. 1, p. e170

Voir la notice de l'article provenant de la source Cambridge University Press

We build on a 1990 paper of Bukovský and Copláková-Hartová. First, we remove the hypothesis of ${\mathsf {CH}}$ from one of their minimality results. Then, using a measurable cardinal, we show that there is a $|\aleph _2^V|=\aleph _1$-minimal extension that is not a $|\aleph _3^V|=\aleph _1$-extension, answering the first of their questions. 
Levine, Maxwell. On Namba Forcing And Minimal Collapses. Forum of Mathematics, Sigma, Tome 13 (2025) no. 1, p. e170. doi: 10.1017/fms.2025.10106
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