科研之友
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摘要
Starting with a measurable cardinal kappa of the Mitchell order kappa(++) we construct a model with a precipitous ideal on N-1 but without normal precipitous ideals. This answers a question by T. Jech and K. Prikry. In the constructed model there are no Q-point precipitous filters on N-1, i.e. those isomorphic to extensions of Cub(N1).
- 出版日期2013-6
