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Necessary and sufficient conditions for the existence of an n-subtle cardinal

机译:n微妙基数存在的充要条件

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摘要

We extend the work of Abe in [1], to show that the strong partition relation C → (n+ 2)_(<-reg~(n+1)) , for every C ∈ WNS_(κ,λ)~*, is a consequence of the existence of an n-subtle cardinal. We then build on Kanamori's result in [10], that the existence of an n-subtle cardinal is equivalent to the existence of a set of ordinals containing a homogeneous subset of size n + 2 for each regressive coloring of n + 1-tuples from the set. We use this result to show that a seemingly weaker relation, in the context of P_κλ is also equivalent. This relation is a new type of regressive partition relation, which we then attempt to characterize.
机译:我们在[1]中扩展了Abe的工作,表明对于每个C∈WNS_(κ,λ)〜*,强分配关系C→(n + 2)_(<-reg〜(n + 1)),是n微妙基数存在的结果。然后我们基于Kanamori在[10]中的结果,n-微妙基数的存在等于存在一组序数,这些序数包含n + 1元组的每个回归着色的大小为n + 2的同质子集。集合。我们用这个结果表明,在P_κλ的情况下,一个看似较弱的关系也是等效的。此关系是一种新型的回归分区关系,然后我们尝试对其进行表征。

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