论文标题
Shelah的PCF操作员无限积累
Unlimited accumulation by the Shelah's PCF operator
论文作者
论文摘要
Modulo是大型红衣主教的存在，有一个集合理论的模型，其中某些$ b $的常规红衣主教，序列$ \ langle \ text {pcf}^α（b）：α\ in \ in \ text {ord} \ rangle $严格增加。结果回答了[7]的问题。
Modulo the existence of large cardinals, there is a model of set theory in which for some set $B$ of regular cardinals, the sequence $\langle \text{pcf}^α(B): α\in \text{Ord} \rangle$ is strictly increasing. The result answers a question from [7].
