There may be a unique $Q$-point
There may be a unique $Q$-point
We show that in the model obtained by iteratively pseudo-intersecting a Ramsey ultrafilter via a length-$\omega_2$ countable support iteration of restricted Mathias forcing over a ground model satisfying $\textsf{CH}$, there is a unique $Q$-point up to isomorphism.
Lorenz Halbeisen、Silvan Horvath、Saharon Shelah
数学
Lorenz Halbeisen,Silvan Horvath,Saharon Shelah.There may be a unique $Q$-point[EB/OL].(2025-05-23)[2025-06-12].https://arxiv.org/abs/2505.17960.点此复制
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