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arxiv: 1706.07141 · v2 · pith:IT6UN45Inew · submitted 2017-06-21 · 🧮 math.LO

The Linearity of the Mitchell Order

classification 🧮 math.LO
keywords ultrafiltersmitchellnormalorderassumingaxiomcardinalscertain
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We show from a weak comparison principle (the Ultrapower Axiom) that the Mitchell order is linear on certain kinds of ultrafilters: normal ultrafilters, Dodd solid ultrafilters, and assuming GCH, generalized normal ultrafilters. In the process we prove a generalization of Solovay's lemma to singular cardinals.

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