We answer a question of Blass, Di Nasso, and Forti [2, 7] by proving, assuming Continuum Hypothesis or Martin’s Axiom, that (1) there exists a P-point which is not interval-to-one and (2) there exists an interval-to-one P-point which is neither quasi-selective nor weakly Ramsey.

中文翻译：

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慢速 P 点超滤器

我们通过证明，假设连续统假设或马丁公理，来回答 Blass、Di Nasso 和 Forti [2, 7] 的问题，即 (1)磷- 不是间隔对一的点，并且 (2) 存在间隔对一磷- 既不是准选择性也不是弱拉姆齐的点。