THE KETONEN ORDER

THE KETONEN ORDER
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DOI:
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发表时间:
2020
期刊:
Journal of Symbolic Logic (JSL)
影响因子:
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通讯作者:
G. Goldberg
G. Goldberg
中科院分区:
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文献类型:
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作者:
G. Goldberg

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本文研究了Ketonen [2]引入的可数完备超滤子上的一个偏序,它是Mitchell序的推广。我们的主要结果是:Ketonen阶是有根据的;它的线性等价于作者在论文[1]中介绍的超幂公理;最后,在超幂公理的假设下,Ketonen阶与广义描述集合论意义下的Lipschitz约化是一致的。
Abstract We study a partial order on countably complete ultrafilters introduced by Ketonen [2] as a generalization of the Mitchell order. The following are our main results: the order is wellfounded; its linearity is equivalent to the Ultrapower Axiom, a principle introduced in the author’s dissertation [1]; finally, assuming the Ultrapower Axiom, the Ketonen order coincides with Lipschitz reducibility in the sense of generalized descriptive set theory.