On cuts in ultraproducts of linear orders I

preprint2016arXivOpen access

Abstract

For an ultrafilter DD on a cardinal κ,κ, we wonder for which pair (θ1,θ2)(θ_1, θ_2) of regular cardinals, we have: for any (θ1+θ2)+−(θ_1+θ_2)^+-saturated dense linear order J,Jκ/DJ, J^κ/ D has a cut of cofinality (θ1,θ2).(θ_1, θ_2). We deal mainly with the case θ1,θ2>2κ.θ_1, θ_2 > 2^κ.

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